Vendors offer 2pp 3gp 3sp 7cp +/- (depending on faction and level) for this item.
Also, no one seems to have tried it on multiple characters. I sent the item's link to myself when I was "double-boxing" on two accounts at once. To my level 30 enchanter it only offered 11 AC etc., whereas to my level 58 Ranger it was showing an AC of 14, and all stats increased proportionately, which I can only guess is do to the level differential between the two characters -- as this was instantaneous and at the same time of day/night. Much like the other defiant charms, such as the one that works off of your language skills for the common races, it is not merely one constant set of stats.