Classifieds at the time of posting this suggestion.

x1 at 6.22 ref - http://i.imgur.com/obND7p7.png

x12 at 6.33 ref - http://i.imgur.com/ZxgyJgY.png http://i.imgur.com/CziZS0F.png http://i.imgur.com/JNhYHZA.png

x1 at 6.55 ref- http://i.imgur.com/zxo1Iax.png

x2 at 6.66 ref - http://i.imgur.com/luYA2Sq.png

x1 at 8 ref - http://i.imgur.com/q0ZihpX.png

x1 at 9 ref - http://i.imgur.com/Avy28vv.png

The rest are special levels or has paints.

Sellers on Outpost.

http://www.tf2outpost.com/trade/28346478 - 7.11 ref, young.

http://www.tf2outpost.com/trade/28331639 - 7 ref, 5 days old.

http://www.tf2outpost.com/trade/28335405 - 7 ref, 4 days old.

http://www.tf2outpost.com/trade/28339343 - 7 ref, 3 days old.

http://www.tf2outpost.com/trade/28337990 - 7 ref, 3 days old.

http://www.tf2outpost.com/trade/28296422 - 6.66 ref, 2 weeks old.

http://www.tf2outpost.com/trade/28340218 - 6.66 ref, 2 days old.

http://www.tf2outpost.com/trade/28344280 - 6.55 ref, 1 day old.

http://www.tf2outpost.com/trade/28345661 - 6.55 ref, young.

http://www.tf2outpost.com/trade/28321435 - 6.33 ref, 1 week old.

http://www.tf2outpost.com/trade/28344455 - 6.33 ref, 1 day old.

http://www.tf2outpost.com/trade/28347052 - 6.22 ref, young.

http://www.tf2outpost.com/trade/28340056 - 6 ref, sold after roughly 2 days.

-

http://www.tf2outpost.com/trade/28333941 - "cheaper than bp.tf", unsold for 4 days.

I am excluding all sellers with their price as "bp.tf price" as the item has a flexible price.

The immense amount of sellers at 6.33, many unsolds at 6.66-7, and a couple sellers below 6.33 that's not selling particularly fast makes it reasonable to reduce the price to 6.33 flat.