Not many of these hit the market...

http://www.tf2outpost.com/trade/27836305

Sold + Sunbeams Yellow belt as a bulk deal for cash.

Not usable

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http://www.tf2outpost.com/trade/27903828

Sold for Sold for DP Soldered Sensei + 14 keys + Australium Sticky + FN Liquid Asset (~54 keys total)

https://gyazo.com/f1bc599deff71086092176eaa2554994

What I sold the items for:

http://www.tf2outpost.com/trade/27926018

Sensei: quicksold for 14 keys in ~20 minutes

Liquid Asset: sold for 7 keys in a few hours

Australium Sticky: sold for 17 keys after a day.

In total:

14 + 14 + 17 + 7 = 52, capped by B/O of 50

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These are the only sales I know of. Going with 50 flat.

If you have any other recent sales, please let me know :)