Buying Collector's Chemistry Sets for 4 keys.

Not buying the ready collector's weapons, only interested in the chemistry sets.

Full list of prices:
Collector's Force-A-Nature Chemistry Set - 4 keys
Collector's Shortstop Chemistry Set - 4 keys
Collector's Soda Popper Chemistry Set - 4 keys
Collector's Baby Face's Blaster Chemistry Set - 4 keys
Collector's Festive Force-A-Nature Chemistry Set - not buying
Collector's Back Scatter Chemistry Set - 4 keys
Collector's Bonk! Atomic Punch Chemistry Set - 4 keys
Collector's Crit-a-Cola Chemistry Set - 4 keys
Collector's Mad Milk Chemistry Set - 4 keys
Collector's Winger Chemistry Set - 4 keys
Collector's Pretty Boy's Pocket Pistol Chemistry Set - 4 keys
Collector's Flying Guillotine Chemistry Set - 4 keys
Collector's Sandman Chemistry Set - 4 keys
Collector's Holy Mackerel Chemistry Set - 4 keys
Collector's Boston Basher Chemistry Set - 4 keys
Collector's Candy Cane Chemistry Set - 4 keys
Collector's Sun-on-a-Stick Chemistry Set - 4 keys
Collector's Fan O'War Chemistry Set - 4 keys
Collector's Atomizer Chemistry Set - 4 keys
Collector's Wrap Assassin Chemistry Set - 4 keys
Collector's Direct Hit Chemistry Set - 4 keys
Collector's Black Box Chemistry Set - 4 keys
Collector's Rocket Jumper Chemistry Set - 4 keys
Collector's Liberty Launcher Chemistry Set - 4 keys
Collector's Cow Mangler 5000 Chemistry Set - 4 keys
Collector's Original Chemistry Set - 4 keys
Collector's Beggar's Bazooka Chemistry Set - 4 keys
Collector's Festive Black Box Chemistry Set - not buying
Collector's Air Strike Chemistry Set - 4 keys
Collector's Buff Banner Chemistry Set - 4 keys
Collector's Gunboats Chemistry Set - 4 keys
Collector's Battalion's Backup Chemistry Set - 4 keys
Collector's Concheror Chemistry Set - 4 keys
Collector's Mantreads Chemistry Set - 4 keys
Collector's Reserve Shooter Chemistry Set - 4 keys
Collector's Righteous Bison Chemistry Set - 4 keys
Collector's B.A.S.E. Jumper Chemistry Set - 2 keys
Collector's Equalizer Chemistry Set - 4 keys
Collector's Pain Train Chemistry Set - 3 keys
Collector's Half-Zatoichi Chemistry Set - 4 keys
Collector's Disciplinary Action Chemistry Set - 4 keys
Collector's Market Gardener Chemistry Set - 4 keys
Collector's Escape Plan Chemistry Set - 4 keys
Collector's Backburner Chemistry Set - 4 keys
Collector's Degreaser Chemistry Set - 4 keys
Collector's Phlogistinator Chemistry Set - 4 keys
Collector's Rainblower Chemistry Set - 4 keys
Collector's Flare Gun Chemistry Set - 4 keys
Collector's Detonator Chemistry Set - 4 keys
Collector's Reserve Shooter Chemistry Set - 4 keys
Collector's Manmelter Chemistry Set - 4 keys
Collector's Scorch Shot Chemistry Set - 4 keys
Collector's Festive Flare Gun Chemistry Set - not buying
Collector's Axtinguisher Chemistry Set - 4 keys
Collector's Homewrecker Chemistry Set - 4 keys
Collector's Powerjack Chemistry Set - 4 keys
Collector's Back Scratcher Chemistry Set - 4 keys
Collector's Sharpened Volcano Fragment Chemistry Set - 4 keys
Collector's Postal Pummeler Chemistry Set - 4 keys
Collector's Third Degree Chemistry Set - 4 keys
Collector's Lollichop Chemistry Set - 4 keys
Collector's Neon Annihilator Chemistry Set - 4 keys
Collector's Loch-n-Load Chemistry Set - 4 keys
Collector's Ali Baba's Wee Booties Chemistry Set - 4 keys
Collector's Bootlegger Chemistry Set - 4 keys
Collector's Loose Cannon Chemistry Set - 4 keys
Collector's B.A.S.E. Jumper Chemistry Set - 2 keys
Collector's Chargin' Targe Chemistry Set - 4 keys
Collector's Scottish Resistance Chemistry Set - 4 keys
Collector's Sticky Jumper Chemistry Set - 4 keys
Collector's Splendid Screen Chemistry Set - 4 keys
Collector's Tide Turner Chemistry Set - 4 keys
Collector's Eyelander Chemistry Set - 4 keys
Collector's Pain Train Chemistry Set - 4 keys
Collector's Scotsman's Skullcutter Chemistry Set - 4 keys
Collector's Claidheamh Mòr Chemistry Set - 4 keys
Collector's Ullapool Caber Chemistry Set - 4 keys
Collector's Half-Zatoichi Chemistry Set - 4 keys
Collector's Persian Persuader Chemistry Set - 4 keys
Collector's Nessie's Nine Iron Chemistry Set - 4 keys
Collector's Scottish Handshake Chemistry Set - 4 keys
Collector's Festive Eyelander Chemistry Set - not buying
Collector's Natascha Chemistry Set - 4 keys
Collector's Brass Beast Chemistry Set - 2 keys
Collector's Tomislav Chemistry Set - 2 keys
Collector's Huo-Long Heater Chemistry Set - 2 keys
Collector's Sandvich Chemistry Set - 4 keys
Collector's Dalokohs Bar Chemistry Set - 2 keys
Collector's Buffalo Steak Sandvich Chemistry Set - 2 keys
Collector's Family Business Chemistry Set - 4 keys
Collector's Killing Gloves of Boxing Chemistry Set - 2 keys
Collector's Gloves of Running Urgently Chemistry Set - 2 keys
Collector's Warrior's Spirit Chemistry Set - 2 keys
Collector's Fists of Steel Chemistry Set - 2 keys
Collector's Eviction Notice Chemistry Set - 2 keys
Collector's Holiday Punch Chemistry Set - 2 keys
Collector's Festive Gloves of Running Urgently Chemistry Set - not buying
Collector's Frontier Justice Chemistry Set - 4 keys
Collector's Widowmaker Chemistry Set - 2 keys
Collector's Pomson 6000 Chemistry Set - 4 keys
Collector's Rescue Ranger Chemistry Set - 2 keys
Collector's Wrangler Chemistry Set - 2 keys
Collector's Short Circuit Chemistry Set - 2 keys
Collector's Festive Wrangler Chemistry Set - not buying
Collector's Gunslinger Chemistry Set - 2 keys
Collector's Southern Hospitality Chemistry Set - 2 keys
Collector's Jag Chemistry Set - 4 keys
Collector's Eureka Effect Chemistry Set - 4 keys
Collector's Blutsauger Chemistry Set - 2 keys
Collector's Crusader's Crossbow Chemistry Set - 4 keys
Collector's Overdose Chemistry Set - 2 keys
Collector's Festive Crusader's Crossbow Chemistry Set - not buying
Collector's Kritzkrieg Chemistry Set - 4 keys
Collector's Quick-Fix Chemistry Set - 4 keys
Collector's Vaccinator Chemistry Set - 4 keys
Collector's Ubersaw Chemistry Set - 4 keys
Collector's Vita-Saw Chemistry Set - 2 keys
Collector's Amputator Chemistry Set - 2 keys
Collector's Solemn Vow Chemistry Set - 2 keys
Collector's Huntsman Chemistry Set - 4 keys
Collector's Sydney Sleeper Chemistry Set - 2 keys
Collector's Bazaar Bargain Chemistry Set - 2 keys
Collector's Machina Chemistry Set - 2 keys
Collector's Hitman's Heatmaker Chemistry Set - 4 keys
Collector's Fortified Compound Chemistry Set - 4 keys
Collector's Classic Chemistry Set - 4 keys
Collector's Jarate Chemistry Set - 4 keys
Collector's Razorback Chemistry Set - 2 keys
Collector's Darwin's Danger Shield Chemistry Set - 2 keys
Collector's Cozy Camper Chemistry Set - 4 keys
Collector's Cleaner's Carbine Chemistry Set - 2 keys
Collector's Festive Jarate Chemistry Set - not buying
Collector's Tribalman's Shiv Chemistry Set - 2 keys
Collector's Bushwacka Chemistry Set - 2 keys
Collector's Shahanshah Chemistry Set - 2 keys
Collector's Ambassador Chemistry Set - 4 keys
Collector's L'Etranger Chemistry Set - 4 keys
Collector's Enforcer Chemistry Set - 2 keys
Collector's Diamondback Chemistry Set - 2 keys
Collector's Your Eternal Reward Chemistry Set - 2 keys
Collector's Conniver's Kunai Chemistry Set - 4 keys
Collector's Big Earner Chemistry Set - 4 keys
Collector's Spy-cicle Chemistry Set - 4 keys
Collector's Cloak and Dagger Chemistry Set - 4 keys
Collector's Dead Ringer Chemistry Set - 4 keys
Collector's Red-Tape Recorder Chemistry Set - 4 keys
Collector's Festive Sapper Chemistry Set - not buying
Collector's Conscientious Objector Chemistry Set - 4 keys
Collector's Bat Outta Hell Chemistry Set - 4 keys