This is a link from Lowrance for the factory outlet store. You could look on E-Bay but the new 4.3" screen model is too new so you won't find any deals. I have upgraded from Lowrance x50ds to Elite 4 (which has the gps). I just bought the head unit and use the original transducer that I already had 83/200HZ. That only cost me $81 on an E-Bay auction and bought the base for $17. I also found another of the same unit including the transducer that had the attachment for the bracket broken off. It all works and I got it for a wining bid of $86. So now both my kayak have the same system for a very low cost to upgrade both. Good Luck
http://lr.factoryoutletstore.com/det...egory_id=35370