5 month old price

http://www.tf2outpost.com/trade/18119135

Sold for harvest Dapper + 10 keys + ~3 keys in items = ~5.1 buds

http://backpack.tf/id/76561197966905013?time=1392883200

http://backpack.tf/id/76561197966905013?time=1393056000

http://www.tf2outpost.com/trade/17416326

Sold for 6 pure

http://www.tf2outpost.com/trade/16340959

Sold for Sulphurous Fed Fightin Fedora + Nuts n Bolts Bonk Boy

This is probably about 5 buds.

http://www.tf2outpost.com/trade/17163312

Offered + lvl 97 max for Terror Brainiac

http://backpack.tf/id/76561198022050966?time=1390723200

http://backpack.tf/id/76561198022050966?time=1390982400

Brainiac is old priced, current B/Os are 8-9 sales have ranged from 6-8: http://backpack.tf/vote/id/52eb35444dd7b833068b4568

That would make the range of this sale = 3.5-5.5 buds

Current Trades:

http://www.tf2outpost.com/trade/14762936 B/O 8 buds

http://www.tf2outpost.com/trade/17762018 B/O 7.5 buds

These are the only sales i could find in the last few months. I'm going with 5-6 as a conservative drop.