Let's make that range smaller...

2@5

1@5.33

1@5.55

2@5.66

Proof: https://gyazo.com/8b7272f7a24fedc46f33d35f59c63d6e

1@5.77

1@5.88

1@6

Proof: https://gyazo.com/3232620cf2fd8071af43e85bde510b98

13 more @6

Proof: https://gyazo.com/ce05ea6d01c417e8e4a9151d2d49353a ; https://gyazo.com/4d44f6a0e6f0c139b11ac15f95ae65a5 ; https://gyazo.com/30c8aaeee67cc6652cc66f3ed9255638

Nobody is selling for more that 6, only with paints: https://gyazo.com/2f48b39abbbcc103aea3e7167180ebf8

TF2Outpost:

http://www.tf2outpost.com/search/262953945 @ 5.33

http://www.tf2outpost.com/trade/28061778 @ 5 (has a duplicate listing here)

http://www.tf2outpost.com/trade/28059260 @ 6

http://www.tf2outpost.com/trade/28046499 @ 6 (unsold, 4 days old)

http://www.tf2outpost.com/trade/28029990 @ 6.66 (unsold, 1 week old)

http://www.tf2outpost.com/trade/28041324 lots for sale @ 5.66 (even these ones are unsold, 5 days old)

I should probably lower it even more, but there are still sellers @ around 6.