bought for one key

http://prntscr.com/5a386y

Sellers at 1 key

http://www.tf2outpost.com/trade/23868936 young

http://www.tf2outpost.com/trade/23841336 mass seller

http://www.tf2outpost.com/trade/15654461 it's not really a year old I don't think he must have just recently opened it he end of this halloween.

http://www.tf2outpost.com/trade/23558395 sold 1 someone interested in buying 2? a week ago

Sellers at "around 6-7 ref" according to his comment

http://www.tf2outpost.com/trade/23716174

Sellers at 1 key 1 ref

http://www.tf2outpost.com/trade/23754638

classifieds at the time of posting http://prntscr.com/5a3d6q

Has an offer of 1.2 keys http://www.tf2outpost.com/trade/23747463

1 key seems to be the most common trading point.