Anyone know where i could get an inexpensive fishfinder.

just need one for my cartop.

I owned a Humminbird PiranhaMAX 170 (list price is 99.99) that was perfectly fine. Used it on my kayak for a year before I upgraded to something more suitable for salt water with GPS nav.

dam i just bought one.

It's a portable fishfinder.... Called fishin buddy... Tells water temps bottom structure.... It works great .... Got it at dicks sporting goods for 130

if you are still looking i have a few garmens with transducer let me know

dam i just bought one.

I was going to suggest the Hummingbird 550 portable great unit 5 inch display 299$

I heard if your gonna spend the money make sure you get either the HB with down imaging (HB 500 Di) or the lowrance 5x down scanning, both around $300 and available in portable with suction cup to kayak or inflatable. I've been really eyeing the lowrance unit.

Down imaging is really good for showing structure, such as underwater trees, around which bass will congregate. However, down imaging is not very good at showing fish; they show up as very tiny blobs that are difficult to distinguish from the background. For bass fishing, down imaging, or side imaging, is probably sufficient. If you are fishing deeper water where fish may be suspended in the thermocline you are better off with a standard fish finder. Because I do frequent ocean excursions, I own a Humminbird 597 ci HD DI which includes both plus GPS. It is awesome but I would not consider it "inexpensive".

Scooby, I think you mean the 570 DI...it's on Amazon for $274.