All credits to Julia the nub

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Sold for 450 keys pure:

http://www.tf2outpost.com/trade/26277705

http://backpack.tf/profiles/76561198024925599?time=1435302000 (June 26th)

http://backpack.tf/profiles/76561198024925599?time=1435474800 (June 28th)

450 keys

Some item IDs are strange and confirmation would be appreciated.

Sold for Fountain of Delight Taunt: Conga (320) + 40 keys:

http://backpack.tf/profiles/76561197987579006?time=1432364400 (May 23rd)

http://backpack.tf/profiles/76561197987579006?time=1432450800 (May 24th)

320 + 40 = 360 keys

Showstopper was offered on Julia's Fountain of Delight.

Sold for ~300 keys in taunts.

http://backpack.tf/profiles/76561198157356020?time=1432278000 (May 22nd)

http://backpack.tf/profiles/76561198157356020?time=1432364400 (May 23rd)

Excluding this sale. Seller was not an experienced trader and was sending trade offers to anyone with unusual taunts. 300 keys was also rejected here: http://i.imgur.com/wSyolYg.png