This is my 3rd suggestion, so feedback is appreciated. The price is 3 months old, so it needs a bump. If there is a lot of offers on a trade, I put the highlights. Only a few offers, and I put them all.

http://www.tf2outpost.com/trade/8916631

Buyout: Unknown

Offers: 1 bud

Orbiting Fire Safe N Sound + 3 keys (27-30 keys)

http://www.tf2outpost.com/trade/8916631

Buyout: Unknown

Offers: G Fetti Stainless Pot + 3 keys + 6 ref (23.8-30.8 keys, same guy as Orb Fire SNS in first trade)

1 bud

http://www.tf2outpost.com/trade/6479893

Buyout: 2 buds

Offers: 1 bud

1 bud + 1 key

Blizz Birdcage (1.2-1.6 buds)

http://www.tf2outpost.com/trade/8603437

Buyout: 1 bud + 8 keys, more in Unusuals or items

Offers: Bubbling Larrikin Robin (16-19 keys)

18 keys

Hitt Mann #7 (9 keys)

1 bud (Same guy who offered 1 bud + 1 key in 3rd trade)

Conclusion: Every trade is getting an offer of at least a bud, so I think this hat should go up slightly. Even though there's 40 of these, there is only 5 on the market (There was another trade http://www.tf2outpost.com/trade/9005160, but he just wants to upgrade his Attendant.). I think the price should go up, but only slightly.