My first skin (re)suggestion, lets try it!

Sellers at 22 and 26 keys. Seller at 22 is one month mature.

SALES

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http://www.tf2outpost.com/trade/29215736 - B/O 27 keys

https://backpack.tf/profiles/76561197961066474#!/compare/1497398400/1497571200

Seller apparently gave up and quicksold for 18 keys pure. Excluding.

http://www.tf2outpost.com/trade/29247289 - B/O 21 keys

https://backpack.tf/profiles/76561198094790391#!/compare/1498521600/1498780800

https://backpack.tf/profiles/76561198110832151#!/compare/1498176000/1498780800

$43 PayPal

I added the seller and he said that he sold for $43. http://imgur.com/nZ50nHI

Further proof: https://backpack.tf/trust/76561198110832151

Caps at B/O even though he said it was a quicksell. It took to long to sell, wasn't even an outlier, and it wasn't even priced anyways for it to be considered a quicksell.

Supportive SCM sale:

https://steamcommunity.com/market/listings/440/Strange%20Purple%20Range%20Sniper%20Rifle%20%28Minimal%20Wear%29

Sold for $59.24 / Keys were $2.43 at the time = 24 keys

Excluding because these aren't allowed as proof in non-unusual price suggestions.

We have:

Mature seller at 22 keys

Cash sale at 21 keys

(Invalid) SCM sale at 24 keys.

All other sales are outdated. Going with 21 keys.