Very challenging to sell for 3 keys, there are plenty of trades open selling for less. Demand for this has dropped by a large amount, almost none are sold (though a lot of the 3 key ones have 2 key offers.)

Unsold for 3 keys

http://www.tf2outpost.com/trade/7866937 - Unsold for 3 keys

http://www.tf2outpost.com/trade/7706239 - Unsold for 3 keys

http://www.tf2outpost.com/trade/7967567 - Unsold for 3 keys

http://www.tf2outpost.com/trade/6846200 - Unsold for 3 keys

http://www.tf2outpost.com/trade/7903300 - Unsold for 3 keys

http://www.tf2outpost.com/trade/7872902 - Unsold for 3 keys

http://www.tf2outpost.com/trade/7955225 - Unsold for 3 keys

http://www.tf2outpost.com/trade/7927115 - Unsold for 3 keys

http://www.tf2outpost.com/trade/7914623 - Unsold for 3 keys

http://www.tf2outpost.com/trade/7948122 - Unsold for 3 keys

http://www.tf2outpost.com/trade/7845532 - Unsold for 3 keys

http://www.tf2outpost.com/trade/7836775 - Unsold for 3 keys

http://www.tf2outpost.com/trade/7974379 - Unsold for 3 keys

http://www.tf2outpost.com/trade/7969710 - Unsold for 3 keys

http://www.tf2outpost.com/trade/7972118 - Unsold for 3 keys

http://www.tf2outpost.com/trade/7967046 - Unsold for 3 keys

http://www.tf2outpost.com/trade/7873633 - Unsold for 3 keys

http://www.tf2outpost.com/trade/7932379 - Unsold for 3 keys

http://www.tf2outpost.com/trade/7931910 - Unsold for 3 keys

http://www.tf2outpost.com/trade/7744349 - Unsold for 3 keys

http://www.tf2outpost.com/trade/7813826 - Unsold for 3 keys

Sold/Selling for 2.5 keys

http://www.tf2outpost.com/trade/7977798 - Selling for 2.5 keys

http://www.tf2outpost.com/trade/7914938 - Selling for 2.5 keys

http://www.tf2outpost.com/trade/7863994 - Selling for 2.5 keys

http://www.tf2outpost.com/trade/7907496 - Selling for 2.5 keys

http://www.tf2outpost.com/trade/7813826 - Selling for 2.5 keys

Sold/Selling for 2 keys

http://www.tf2outpost.com/trade/7920425 - Selling for 2 keys

http://www.tf2outpost.com/trade/7807946 - Selling for 2 keys

Going to be cautious on this one and leave it at 2 - 2.5. This probably won't stop dropping until the release of crate 50.