My first suggestion, please don't judge me.

Proof :

Sellers

http://www.tf2outpost.com/trade/18553407 B/O 1 buds + 3 keys. Has an offer of 1 bud | 2 weeks

http://www.tf2outpost.com/trade/18962389 B/O 1.2 buds | Only a few hours but I still included

http://www.tf2outpost.com/trade/18825925 Same guy as the below

http://www.tf2outpost.com/trade/18909336 Selling for 30 keys, for 6 days if you count the trade above

http://www.tf2outpost.com/trade/18212505 1.5 buds | 1 month

http://www.tf2outpost.com/trade/18297382 1.5 buds | 1 month

I didn't catch any sales, and most of the offers has outdated unusuals.

Comment for all the critism, counter-proof and if I need a different range.