http://www.tf2outpost.com/trade/8385788 - Got an offer of 22 keys, and another offer of 23 keys. Also got an offer of a 50$ steam game (buds are around 33$).

http://www.tf2outpost.com/trade/8299122 - Got an offer of 22 keys.

http://www.tf2outpost.com/trade/8167172 - Got an offer of 22 keys twice.

http://www.tf2outpost.com/trade/7713380 - Got an offer of Orbiting Planets Janissary Ketche (18-23 keys). Got another offer of a Bubbling Brigade Helm (20-26 keys). Also got another offer of 21 keys.

http://www.tf2outpost.com/trade/7680374 - Got an offer of 20 keys and is willing to sell his for 22 keys. It seems like the owner didn't sell it for 22 keys, but he got an offer of 22 keys none the less.

It seems everyone else besides the last link owner want's a bud for this hat. That highest offer was The Bubbling Brigade Helm being 26 keys at max. Mostly getting around 20 key offers. It seems this hat is rather wanted by the community.