This needs a drop.

Classified ads at time of posting:

http://backpack.tf/classifieds/?item=Rust%20Botkiller%20Medi%20Gun%20Mk.I&quality=11&tradable=1&craftable=1

1*3 refined

1*3.22 refined

2*3.33 refined

Unsolds at 3.33 refined:

http://www.tf2outpost.com/trade/24877894 (Has 7, 1 month)

http://www.tf2outpost.com/trade/25296188 (2 weeks)

http://www.tf2outpost.com/trade/25443580 (2 days)

http://www.tf2outpost.com/trade/25435308 (2 days, never bumped)

Unsold at 3.22 refined:

http://www.tf2outpost.com/trade/25416479 (4 days)

Unsolds at Bp tf price:

http://www.tf2outpost.com/trade/25410476 (5 days)

http://www.tf2outpost.com/trade/25446281 (1 day, young)

http://www.tf2outpost.com/trade/25353150 (1 week, poorly bumped)

http://www.tf2outpost.com/trade/25304539 (2 weeks, poorly bumped)

Unsold at 3.11 refined:

http://www.tf2outpost.com/trade/25462045 (Young)

Seller at 3 refined:

http://www.tf2outpost.com/trade/25455910 (1 day old)

This is all I could find on Outpost are valid