6 month old price. Lower tiered effects are good at maintaining their value over time.

http://www.tf2outpost.com/trade/18620467

Bought a Stormy Fancy Fedora, added 3 keys

(2.2 buds)

http://www.tf2outpost.com/item/440,2445117231,55,5

http://www.tf2outpost.com/trade/18617895

Apparently also quickbought for 2 buds + 3 keys

(2.2 buds)

http://www.tf2outpost.com/trade/18407649

Offer: 2 buds, 8 keys

(2.4 buds)

http://www.tf2outpost.com/trade/17160792

Quicksell: 40 keys (2.0 buds)

This may or may not be enough evidence, contribute if you can please by supporting or counter-proofing!