My Thai girlfriend took me to the Moo Wanna pork and chicken market on the Southwest corner of Soi 68 and Phetkasm Road.
They have copious amounts of raw disassembled pigs and chickens there. And small amounts of beef.
The place is air conditioned, no flies and very busy with serious looking Thai people, no posers or tourists here. I am the only farang.
Sort of like a wholesale pig outlet for restaurants. Great selection of everything.
So I am thinking the prices must be good. We bought a weeks worth of pork and chicken along with vegetables.
if you cook your own pork ribs, they had slabs lined up.

some of the pork and chicken was already marinated. The check out process was fast as the meat is weighed, wraped and labeled with cost before you get in line. I would say you could get by on sign language here if you do not speak Thai.