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If it's gotta be that specific smoker, looks like your best bet is to post your WTB request on every outdoor cooking board on the 'net...in hopes of finding someone who's selling a used one. And of course there's CL. You never know...you might get lucky.
You could also use the search feature to browse for members here who own them...you might find someone to PM your request. Even if they don't want to sell, maybe they would have more info on where to find one. I already did a search...this link shows the results: