Same price as the other suggestion, now with Minis.

http://backpack.tf/item/3173579474

Sale 1) Sold for a Duped GE TC (410) + 20 Keys = 430 Keys

http://backpack.tf/profiles/76561198039731024?time=1442559600&compare=1442646000

TC Mini

http://backpack.tf/profiles/76561198049609745?time=1435302000&compare=1435474800 --- 410 Keys

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Sale 2) Sold for an Arcana Gibus (202) + Cloudy Modest (195) + Isotope Turbine Torcher Field-Tested (~30) + 15 Keys

http://backpack.tf/profiles/76561197991710013?time=1442905200&compare=1442732400

Everything was then quicksold afterwards for the Stormy 13th Antlers, so the histories don't match

202 + 30 = 232 * 0.9 = ~209 + 210 = 419 Keys

Gibus Mini

Sold + Hellfire Pom-Pom (90) + 8 Keys for a D@D Crone's (open at 300)

http://backpack.tf/profiles/76561198072621189?time=1438326000&compare=1438239600

Modest Mini

http://backpack.tf/profiles/76561198037099955?time=1437980400&compare=1438066800 --- Sold for a Misty Amassment (150) + 60 Keys

Using the old price as it was Updated at the time, there are no other minis for it, and it's currently being sold for 150

150 * 0.9 = 135 + 60 = 195

Torcher Mini

http://steamcommunity.com/market/listings/440/Unusual%20Turbine%20Torcher%20Flame%20Thrower%20%28Field-Tested%29

One is being sold for 60 Euros (~26 Keys)

http://backpack.tf/profiles/76561198082516648?time=1442818800&compare=1442991600 --- Sold for a Spec KS Aussie Flame (~20)

http://backpack.tf/profiles/76561198055756660?time=1441609200&compare=1441782000 --- Sold + S. PDA (9) for a Beams Backbiter (52.5)

Using 52.5 from the closed suggestion's sales

Averaging these to ~30 Keys

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Rounding 419 to 420