I just bought a Lowrance 520c with the transducer and antenna on ebay for a mere $420. It's about 8 months used, but new to me and works fine. I've hooked it up in my living room and been playing with the GPS on it. The boat is not quite ready for it yet. BPS just had a sale on the 522ci for just under $500 NIB. The new ones come with a mapcreate disc I do believe.