You betcha. I just bought a Humminbird Piranha Max 170. They run $99 anywhere. PMax 170
The 170 has two beams, giving you a precise look at what's right below and a pretty good picture of what's a bit to either side (total 90° coverage) plus surface temperature. It has an eight-shade B&W display and come with a transom-mount transducer.
There's a 160 model for $10 less, with only a four-shade display and a single beam, and a three-beam model that's about $50 more. The best for the buck is the 170.
Plus, Humminbird will exchange the transducer for almost any other kind, straight across, if the transom mount won't work for you. I exchanged for a through-hull flush-mount 'ducer for my new kayak, no questions asked and a two-day turnaround.
Battery is not included. I'm going to run mine at first on an eight AA box (Radio Shack, $3) and rechargeable batts which should give me at least five hours of run time. You can get sealed gel or Li-ion batteries from 3 amp hours and up for $20 or so. The fishfinder only draws 250 mA, so you need not worry about running out of juice.