Only 1 page of these selling on outpost and out of that 1 page i found these

http://www.tf2outpost.com/trade/8972409 - unsold at 9

http://www.tf2outpost.com/trade/8990255 - selling at 8

http://www.tf2outpost.com/trade/8953243 - unsold at backpack.tf price

http://www.tf2outpost.com/trade/8671046 - I don't think this person is a series seller considering that he has got lots of good offers and all the items are still in his BP, he has an 8 keys offer and a 10 key offer on the Maul but the 10 key offer also isn't serious since he doesn't have any keys in his BP

http://www.tf2outpost.com/trade/8945468 - selling for 8

http://www.tf2outpost.com/trade/8973945 - selling for 8 keys

http://www.tf2outpost.com/trade/8916921 - unsold at 9 keys but has a person asking for him to reserve it for him at 9 keys. That person's BP is worth a couple keys right now so it isn't a serious offer

http://www.tf2outpost.com/trade/8916454 - unsold at 9 keys and has an 8 key offer

Buyer trader

http://www.tf2outpost.com/trade/8790880 - willing seller at 8 keys

http://www.tf2outpost.com/trade/8486781 - willing seller at 8 keys

http://www.tf2outpost.com/trade/8152863 - has adds at 8 keys

http://www.tf2outpost.com/trade/8587548 - willing seller at 6 keys?

http://www.tf2outpost.com/trade/8754898 - adds at 7 keys 1 ref

http://www.tf2outpost.com/trade/8213078 - seller at S.F. axe + 2 keys (7 keys)

http://www.tf2outpost.com/trade/8778372 - adds at 7.5 keys?

http://www.tf2outpost.com/trade/8604151 - BM at 8 keys

Some older trades

http://www.tf2outpost.com/trade/8611325 - bought at 8 keys

http://www.tf2outpost.com/trade/8619402 - sold 4 for 8 keys each

http://www.tf2outpost.com/trade/8541791 - sold for 8 keys 1 rec

http://www.tf2outpost.com/trade/8537295 - seller at 8 keys

http://www.tf2outpost.com/trade/8611325 - sold for 8 keys

Easy to get at 8 key, doesn't sell at 9 keys