I Look through some Portal 2 sellers and saw they are having trouble or selling below the current price(Proof Below!)

http://www.tf2outpost.com/trade/10130257

been 3 days for 11 keys

http://www.tf2outpost.com/trade/9341676

Been a month for box plus mann co package for 11 keys

http://www.tf2outpost.com/trade/9606464

3 weeks for 11 keys

http://www.tf2outpost.com/trade/10125630

Been 3 days for 10 keys

http://www.tf2outpost.com/trade/10173506

Portal box for spectral spectrum which worth 9-10 keys

http://www.tf2outpost.com/trade/9457069

Some sellers added for portal 2 box

http://www.tf2outpost.com/trade/9665902

Hes buying portal 2 boxes and hided allot of 10 keys

http://www.tf2outpost.com/trade/10183586

Buying portal but hide a sellers who selling his for 10 keys

http://www.tf2outpost.com/trade/9265834

A buyer hide a offer of 9 keys 2 ref