Here, let me help you with that.

Late Counter Suggestion to: http://backpack.tf/vote/id/563a4999b98d882f45e94c04

3 pages of sellers on Outpost at time of posting.

Classified ads at the time of posting:

Page 1 - http://m.imgur.com/NHINjP8

Page 2 - http://m.imgur.com/gk6Snum

http://backpack.tf/classifieds?item=Silver+Botkiller+Sniper+Rifle+Mk.I&quality=11&tradable=1&craftable=1

1*5.88 refined

2*6 refined

2*6.22 refined (1 has long distance kills)

6*6.33 refined

Unsolds at 6.33 refined:

http://www.tf2outpost.com/trade/27174641 (~1 month)

http://www.tf2outpost.com/trade/26939776 (~2 months)

http://www.tf2outpost.com/trade/27366405 (Young)

http://www.tf2outpost.com/trade/27342245 (~4 days)

http://www.tf2outpost.com/trade/27279699 (~2 weeks)

http://www.tf2outpost.com/trade/27356000 (~2 days, never bumped)

http://www.tf2outpost.com/trade/27340025 (~4 days, poorly bumped)

http://www.tf2outpost.com/trade/27329677 (~6 days, never bumped)

http://www.tf2outpost.com/trade/27307452 (~1 week, poorly bumped)

Seller at 6 refined:

http://www.tf2outpost.com/trade/27315716 (~1 week old)

Seller at 5.88 refined:

http://www.tf2outpost.com/trade/27359046 (~1 day old)

This is all I could find on Outpost that are valid at the time of posting this suggestion.