Currently 4 on the market. Could not locate any recent sales however offers in pure exceed current backpack.tf price. Only 2 of the trades have serious offers, so I will be focusing on them.

http://www.tf2outpost.com/trade/10841561

- offered 4 buds and 10 keys 1 day ago by Riko-nee

- offered 3 buds and 17 keys 3 days ago by Bıglele

- offered Robo-Sandvich 3 days ago by Robby★Mason (now working on converting to pure buds and coming back with new offer)

http://www.tf2outpost.com/trade/9343188

- offered 5 buds 1 day ago by Riko-nee

- offered 5 buds 3 weeks ago by shakaka

- offered 4 buds 4 weeks ago by Pixelated

- offered 4 buds 1 month ago by zorroxizi