2.33 ref

http://www.tf2outpost.com/trade/5862396 (SOLD)

1 key

http://www.tf2outpost.com/trade/6950091 (SOLD)

http://www.tf2outpost.com/trade/6689527 (SOLD)

1 key & 0.33 ref

http://www.tf2outpost.com/trade/7030265 (SOLD? No longer in BP)

1 key & 0.88 ref

http://www.tf2outpost.com/trade/6935509 (UNSOLD. People offering 1 key but seller wont go less than 1 key & 0.88)

2 keys

http://www.tf2outpost.com/trade/6837003 (SOLD? No longer in BP)

http://www.tf2outpost.com/trade/6857326 (Offer made 1 day ago)

http://www.tf2outpost.com/trade/7019865 (UNSOLD. Painted pink)

http://www.tf2outpost.com/trade/6850141 (SOLD. Painted TS)

2 keys & 0.33 ref

http://www.tf2outpost.com/trade/6827439 (UNSOLD. Painted in VoT)

Conclusion

Can find some sellers putting the B/O at 1 key but these go quite quick. 2 keys sales are rare and at 2 keys and a bit more, you can even find them in nice paints.