I think it could go lower than this because almost nobody is buying or even offering on it, but I've only found one proof of a seller willing to do that.

SOLD/WILLING BUYERS:

http://www.tf2outpost.com/trade/8749399 G. Plushy (2.66, or 2.33 if new suggestion passes)

http://www.tf2outpost.com/trade/9009561 2.66 (offered, accepted, retracted because he bought something else)

UNSOLD:

http://www.tf2outpost.com/trade/9053050 3 ref (2 days)

http://www.tf2outpost.com/trade/9036275 "Mid Backpack.tf prices" (3 days)

http://www.tf2outpost.com/trade/9057315 2.66 (2 days)

http://www.tf2outpost.com/trade/9017865 2.66 (4 days)

http://www.tf2outpost.com/trade/9017806 2.66 (4 days)

OFFERS:

http://www.tf2outpost.com/trade/8958830 2.33

http://www.tf2outpost.com/trade/8875928 No offers in a week

STILL NEW:

http://www.tf2outpost.com/trade/9101418 3 ref

http://www.tf2outpost.com/trade/9086669 3 ref

BUYERS:

OFFERS:

http://www.tf2outpost.com/trade/8766984 2 ref

http://www.tf2outpost.com/trade/8470916 2.66

http://www.tf2outpost.com/trade/8881498 2.66-3

Let me know what you think.