Sold/Offers/Adds for 2.66/higher

http://i.imgur.com/Veujttd.png sold for 2.66

http://i.imgur.com/GxdKooS.png sold for 2.66

http://i.imgur.com/njjOyIB.png sold for 2.66

http://i.imgur.com/AK9UWDi.png sold for 2.66

http://www.tf2outpost.com/trade/11679645 offer of bp expander, has an add (?)

http://www.tf2outpost.com/trade/11801570 sold at least one for 2.66

http://www.tf2outpost.com/trade/9805354 offer of 2.33, but has sold a lot for 3 ref

http://www.tf2outpost.com/trade/10919226 has sold a lot for 3.66

http://www.tf2outpost.com/trade/11339559 offer of 2.33, 2.44, 2.55, attendant

http://www.tf2outpost.com/trade/9934603 a guy (A-TanK) asking him to add him for 1 key o_o

Still possible for 2.33:

http://www.tf2outpost.com/trade/11774543 offer of 2.33

http://www.tf2outpost.com/trade/11617854 sold for 2.33

http://www.tf2outpost.com/trade/11596675 offer of 2.33

http://www.tf2outpost.com/trade/10970191 has an add for 2.33 but is out of stock

2 ref stays in the range because it's not really that hard to buy it for 2 ref. I'm just suggesting that it's possible to sell for higher.

Myself buying them

http://i.imgur.com/GwWhVMy.png bought for 2 ref

http://i.imgur.com/gmF2Wff.png bought 5 for 2 ref each, 2 for 2.33

http://i.imgur.com/RGqiLew.png bought for 2.11

Not alot of these on the market.