http://www.tf2outpost.com/trade/11835257

Sold for 2 TS Bills, a Lime Bills, and a Vintage Luger if seller adds 4 keys

8.5 + 8.5 + 8.25 + 8 - 4 = 29.25 keys, Bills are currency so I find this a mixed offer. 29.25 x .95 = 27.78, or 28 keys, or 1.2 buds

He has a TS Bills, Lime Bills, and a Vintage Luger in his inventory. I cannot find the other TS Bills, but item histories match up on all the bills and luger, checking this trade: http://www.tf2outpost.com/trade/11885890

http://www.tf2outpost.com/trade/11912222 New trade - 0 offers in 5 days, selling for two buds

http://www.tf2outpost.com/trade/11245800 Other current owner, selling for two buds for 4 weeks. Unsold, top offer is 1 bud

He bought for an Unusual Trusty Mountain Yak. I'm sorry but I have no clue what this is worth as I do not specialize in Dota 2 items.

http://www.tf2outpost.com/trade/10943662 Sold for a Planets Reggae - http://www.tf2outpost.com/trade/10986073

Item histories match up: http://gyazo.com/ee17490a49ad5065f61e27631064aa7c

Planets Reggae - 1.3-1.6 buds x .9 = 1.2-1.4 buds, or 1.3 buds

Conclusion

No good offers, but two sales: Planets Reggae and about 28 keys. That's sales of 1.2 and 1.3, hence, the range of 1.2-1.3 buds. I expect this hat to go down in the future, but for now, this is the range.