you'll be amazed what you can find on craigslist cooker wise up here. I found my lang 84 on craigslist. Don't get me wrong you'll probably have to do some driving
in your area...I would go for a Meadow Creek offset (SQ36) or consider their PR42 (the one I have)....dont think I have ever seen a reverse flow of any quality for that price.
I would seriously check out the Meadow Creek cookers based on the size you need....