Bumping the price:

http://www.tf2outpost.com/trade/9359907 1.66 buds, 6 days, no offers

http://www.tf2outpost.com/trade/9438524, taking offers, 3 days, Stormy Storm | Frenchman's Beret (1.1-1.3)

http://www.tf2outpost.com/trade/9508589, 1 bud, 17 hours (new), no offers

http://www.tf2outpost.com/trade/8658363, taking offers, 1 month, 34 keys offer, Steaming Texas Ten Gallon (1.1-1.3) => Best offer 1.26 buds

http://www.tf2outpost.com/trade/6922615, Blizzardy storm football helmet (23-27 keys), Steaming Texas Ten Gallon (1.1-1.3)

Conclusion: easy to get at 1 bud and a bit above (I think it is due to many people use bp.tf). Offers in unusual hats are low (max 1 bud with overpay)

If you have any other evidence, please post it below