I like this scattergun :3

Classified ads at time of posting:

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

1*2.26 keys

1*2.37 keys

1*2.4 keys

1*2.42 keys (Has Pyros killed)

2*2.53 keys

Unsold at 2 keys and 10 refined (~2.5 keys):

http://www.tf2outpost.com/trade/25326436 (3 weeks)

Unsolds at 2.5 keys:

http://www.tf2outpost.com/trade/25321552 (3 weeks)

http://www.tf2outpost.com/trade/25452329 (1 week)

Unsold at 2 keys and 9 refined (~2.4 keys):

http://www.tf2outpost.com/trade/25464050 (Has Pyros killed, 1 week)

Unsold at Bp tf price:

http://www.tf2outpost.com/trade/25337549 (It's duped, 2 weeks)

Seller at 2 keys and 5 refined (~2.3 keys):

http://www.tf2outpost.com/trade/25527866 (1 day old)

Seller at 2 keys and 4 refined (~2.2 keys):

http://www.tf2outpost.com/trade/25537935 (Young)

Seller at 2 keys:

http://www.tf2outpost.com/trade/25544351 (Has parts, young)

This is all I could find on Outpost that are valid