I've been looking for a GNS 430W to put in my Cardinal and have found one for a reasonable price ($8500, including tray, connectors, antenna, indicator, and documentation) in Beulah, ND. The unit has been checked out by an avionics shop in Bismark and has been yellow tagged. The seller wants me to send him a certified check before he ships it to me (which puts all the risk of the transaction on me). I'd feel better about it if I could find a third party to handle the transaction--someone I could trust that I could send the check to, make the exchange with the seller, and then ship the unit to me. Do any of you have any advice to offer?