Hard to say...
I got a Weber Silver B gasser with upgraded SS grates and flavorizer bars including tank and cover. The cover didn't fit, but it was all free.
I got a newer Gold B for $40. It was even nicer than the Silver B and had a cover that fit.
I got a nice 22.5 gold kettle with some accessories including a cover for $25.
But the best is not smoker related. I got a Wheel Horse 312-8 garden tractor with mower deck and 42" plow blade for $150. The tractor alone was worth at least twice that easy.