There are probably a couple hundred TT models across several dozen brands to fit those requirements, over wide range of price ($12,000 to $40,000), luxury of fittings, and maybe even build quality. Like some of the other guys said, find a RV show, the bigger the better. I needed four big shows to begin to figure out what I wanted, and what I wanted to pay for, before I was ready to start checking out dealerships.
What is at the shows will be new, don't worry about that, you are not there to buy, rather to see what kinds of TTs fit your need. When you figure out what you want, then you look for something like it, used. Those will be at dealers or private sales.