Looking for something similar to what Cabelas is offering, for rental boat use. Here's the link to what they offer:

http://www.cabelas.com/sonar-accessories-portable-transducer-bracket-3.shtml

I already have a Sonar to use. I just need a way to adapt it to various boats. At $55.00 + shipping, I think the above offering is a tad on the expensive side. Looking for something similar, but less costly. I still have to buy a battery! Thanks for any suggestions.

You can always mount your transducer to a board & secure it with a C clamp.