First suggestion, so it's wrong.

http://www.tf2outpost.com/trade/23061872 - selling for 7 ref

http://www.tf2outpost.com/trade/23170162 - selling for 8 ref

http://www.tf2outpost.com/trade/23062097 - Selling for 6 ref

^^Other posts are either in sets or looking for offers^^

~Dat classified thing~

1 for 8 ref

1 for 2 keys (lvl 99)

and one more for 2 keys (no idea why, maybe due to that one above)

~Some posts from bazaar.tf (some of them are also 1-2 months old)~

http://bazaar.tf/trade/271595 - 3 goddamn keys

http://bazaar.tf/trade/862455 - 1 key

http://bazaar.tf/trade/910881 - changes for another ap-sap, maybe this can be counted as 6 ref :P

http://bazaar.tf/trade/536587 - 1.3 keys (12 ref?)

http://bazaar.tf/trade/953931 - 6 ref or 1 key (2months old)

http://bazaar.tf/trade/1006128 - 6 ref

http://bazaar.tf/trade/870256 - 1 key

http://bazaar.tf/trade/971740 - 6 ref

http://bazaar.tf/trade/881361 - 1 key

http://bazaar.tf/trade/898803 - 6 ref

So, it looks like community sells Ap-sap for quite a higher price than the current one, + it's been 3 months since this price was accepted.

8 ref seems to be a good average price now.

P.S. Yes, i have one, not going to sell, he's the only one who talks to me ;_;