These items are items that you normaly can NOT buy. Items from events, or some other happenings. These items are NOT in the store, but still have a price in the AVA database. (Probably for GM reasons) So all ccman can do is make you able to get these weapons that are hidden for us normal user in the AVA shop. It is nearly impossible to change the price since the prices are saved on the AVA database, not on your computer.