Well Jay, fishfinders can start at about $100 and go well into thousands of dollars! Now, since I know the style of fishing you will be doing, and I know you are on somewhat of a budget, I would recomend the GARMIN 300C This model has everything you will need, at an affordable price. And the best place I have found to buy Marine Electronics is http://www.consumersmarine.com/ or you can find some good deals on Ebay if you have the time to shop.Looking for a fish finder recommendation to be used on a canoe or other small craft for inshore/offshore fishing. Nothing fancy per se, something that works.
I have purchased from GPSmart in the past. They seem to have good compeditive prices for a Canadian retailer, and they ship quickly. I would buy from them again!!!!