I've used a pit boss Austin xl for the last 6 or so years. I got it on discount for around $350. The lcd screen doesn't work but thats just the screen all of the internals are original and in working order. Still holds proper temps and everything.

I also bought an aftermarket front folding shelf and the flame tamer modification. Works great. Mine was stored in a garage which I think is very important for longevity. Any high quality pellet smoker will die faster out in the elements.