Really? Is anyone sufficiently stupid as to provide check cashing and banking services for anyone? If this were me, and it's not, I'd inform the specimen hawking these services that they can pay their own help because I'm sure as hell not going to do it. Moreover here in this sandbox, checks clear before any commitment is made for anything when dealing with anything of this sort. Here money flows only one way, in. Never out.
The ghost of Phineas Taylor Barnum rises from the mists, bent over with paroxysms of hysterical laughter.