Not the only sale available:

http://backpack.tf/item/935087680

http://backpack.tf/item/594245132

http://backpack.tf/item/340001757 - 2 other sales

http://backpack.tf/item/281850202

1 sale wouldn't work here.

http://www.tf2outpost.com/trade/24991415 - sold for secret bonnet + bubbling fro

http://www.tf2outpost.com/trade/25131381 - sold with 1 bud for stormy crones

http://www.tf2outpost.com/trade/25358993 - sold with 2 buds for burning stovepipe

More sales involving buds and unusuals, this should be priced in buds, not keys. Put in some effort in your suggestions instead of just using one sale when there are clearly more sales from the same link.

Sold my other one for more than my b/o of 60 keys.

http://www.tf2outpost.com/trade/25635580 - added sweets for a pro aussie rifle + beams snaggle.

A range of 50-60 might work here.