Not sure if it's the cheapest, but Mazdatrix sells them. I can't find it now, but I know that I've also seen the claim that a special adapter is not necessary, and a regular engine stand will work if you line up all four arms on one side of the stand and bolt them to the engine's front cover. Personally, I took apart a couple of 12A's in the bed of a pickup but had no need to reassemble them.

 

pineapple racing comes to mind.

beers