Doug's anchor marine and Advantage RV in watertown, check there should be able to find something that works for ya. otherwise build one for your self, is lots of work but is fun to fish out of one that you made too i think. another perk about building your own, you can spend less money too, if your not after all the fancy things that some of the shacks have that are manufactured. we add a few things each year or as we want to. If you do go with building one, spend the time and money though for good frame, wheel kit or a system that works good and catch covers, after that add more each year if ya can.
