Only two of these known to exist, only one on the market currently.

Has been on the market for 2 months, but gets about 1 good offer a week.

http://www.tf2outpost.com/trade/7919609

Most recent offers include:

Self made key + sweets (6.5 or so? Not sure what these go for)

Secret Jeepcap (6.5 with overpay)

Skull YWN (if they added, probably around a 6.5 offer with overpay)

5 Pure

Scorching Jeep Cap (5 with overpay)

Cauldron HWNN + 1 (around 5.5 with overpay)

All of these offers have been rejected.

Since there is no other hat one sale and the price is out of date, I feel like a slight bump is in order. It's not a stretch to think this hat will eventually get 7, but as things are now it seems the owner could get 6.5 on a somewhat weekly basis, so I will set that as the new high. It seems better than the 6 month old price anyway.