That sounds like a lot of dough for 4 keychain models of OC. I see them a lot cheaper than that. And the postdated check thing sounds pretty fishy too. I hate giving checks anymore, as they have all the info a dirtbag needs to rob you of money. It has your checking account #, routing #, name, address, phone #, etc. I think OC sparays have there place, but just as the old saying goes about not bringing a knife to a gunfight would doubly apply to OC.