Not loads of these being sold, but there's a significant. discrepancy between bp buyers and current price.

Classies (One selling for 3, several buying for ~3.33):

http://imgur.com/DEgQFRX

(All pretty well bumped)

There's a couple of sellers on outpost and Trade.

This guy's bot is selling for 6:

http://imgur.com/a/K3iCE

And one other guy on Outpost has just listed 'bp.tf prices':

http://www.tf2outpost.com/trade/28529306

I hope this was helpful, I recognize that there's not a lot to work with here.