So I'm gonna try this.

http://www.tf2outpost.com/trade/13981191 Got offered 5 pure keys, 7 keys worth of items (3days ago, hype was higher)

http://www.tf2outpost.com/trade/14072919 Selling for 3 keys 3 ref, unsold

http://www.tf2outpost.com/trade/14040718 Selling for 4 keys, Unsold

http://www.tf2outpost.com/trade/14016356 Got offered around 3-3.5 keys worth of items

http://www.tf2outpost.com/trade/14073705 Selling for 3 keys, unsold

http://www.tf2outpost.com/trade/14031968 Selling for 3 keys, unsold

http://www.tf2outpost.com/trade/14049069 Selling for 3 keys, unsold

http://www.tf2outpost.com/trade/14075671 Selling for 3 keys, unsold

http://www.tf2outpost.com/trade/13966888 Got offered 3 keys, seems accepted

http://www.tf2outpost.com/trade/14058008 Selling for 3 keys + 4 ref, unsold

http://www.tf2outpost.com/trade/14071998 Has a C/O of 4 keys, no proof of that though

http://www.tf2outpost.com/trade/14057512 Got offered a bit more than 3 keys worth of items

http://www.tf2outpost.com/trade/14054468 Sold for 1key, had a bunch of interested guys in comments. Seems a quicksell.

http://www.tf2outpost.com/trade/13995682 Got offered 3 keys

http://www.tf2outpost.com/trade/14011781 Buying for 1 key, got adds

http://www.tf2outpost.com/trade/14042184 Buying for a little more than 1 key in items, seems to have an add

Also: http://backpack.tf/classifieds/search/id/521e4f8a4f96f4d15b8b4567 People selling for 2 keys,2.33 keys, 2.5 keys and over 3 keys (at the time of this suggestion).

Not easy to set a price with the current market. People seem to have a bit problem to sell them for 3 keys, and the hype is going down, so i'm leaving the 3 keys out of range. 1 key trades seems to be quicktrading and goes very fast. So i'm gonna try 2-2.5 keys range price and leave it to you guys to decide.

Cheers