If there is an Academy Sports near you they have an ad in today's paper(Sunday) for a Lowrance Mark 5 DSI for $199 after the $50 mail in rebate. I was looking at this unit earlier and it is $300 in most catalogs and stores.
They have it on sale for $249 and apparently there is a factory rebate of $50 for it also. Good price on a down imaging unit.
SeaRay