This is strangely high. Anyway, plenty unsold at 1 key, highest sold I could find was at 2.66, so I'm putting that in as the high end. The lowest seller I could find was 2 ref. 2 - 2.66 is quite a nice price for this, I feel.

1 key

http://www.tf2outpost.com/trade/8223957 - Unsold for 1 key

http://www.tf2outpost.com/trade/8109689 - Unsold for 1 key

http://www.tf2outpost.com/trade/8210075 - Unsold for 1 key

http://www.tf2outpost.com/trade/8213867 - Unsold for 1 key

http://www.tf2outpost.com/trade/8043454 - Unsold for 1 key

http://www.tf2outpost.com/trade/8196746 - Unsold for 1 key

3 ref

http://www.tf2outpost.com/trade/8038440 - Unsold for 3 ref

http://www.tf2outpost.com/trade/8224143 - Unsold for 3 ref

http://www.tf2outpost.com/trade/8186544 - Unsold for 3 ref

2.66

http://www.tf2outpost.com/trade/8042763 - Unsold for 2.66

http://www.tf2outpost.com/trade/8199558 - Unsold for 2.66

http://www.tf2outpost.com/trade/8025023 - Bought for 2.66

2.33

http://www.tf2outpost.com/trade/7905626 - Unsold for 2.33

2 ref

http://www.tf2outpost.com/trade/8232989 - Sold for 2 ref

http://www.tf2outpost.com/trade/8236456 - Selling for 2 ref

Definitely needs a drop. Bit of a tricky one to set an accurate range on, but I've done my best.