This wasn't so much a question of what to buy, but rather a question of how to find one.
I had thought about building a boat, but at the end of the day I'm just not handy enough to do it with any confidence. I do appreciate the suggestion, though.
And perhaps dinghy was not the correct term. I just wanted people to understand that I am having a hard time finding a resource that lists smaller boats under 17 feet or so.