I have had two TT's and only considered a new unit each time. The only way I would buy used is if it was a vintage one that I was gutting.
I want something over which I control the maintenance, cleanliness, and hygiene once it has left the factory.
I bought local and from the same dealer each time. I got a great value on the first one and again on the trade in toward my second one. But, I was an informed consumer going into the sale. At least do a Google search on the make and model that interests you, and that should give you some ballpark figures as to what they are selling for around the country.
I have been very happy with my purchases.
