I'm looking to buy a used roaster anywhere from 3-12 kilos (6-25 lbs) per batch. I'm located in Texas. I've roasted on a Probat L12 but I'm open to anything.
Where in Texas are you? I'm a Texas expat living and roasting coffee in Ireland.
As to used roasters I looked into those myself and found I was just as well off buying a new Ozturk roaster. Of course I was only searching for used roasters in Ireland and the U.K. so didn't have the 'inventory' to draw on that you would. Anyway, good hunting for the used but take a look at Ozturk, you may be pleasantly surprised what they can do for you.
(By the way, I've got no vested interest in Ozturk, just think I happened on a pretty good roaster that had much more to offer, for the price, than other roasters in its size range.)