At our last trip to Costco, we found Kirkland Signature brand pork belly in the pre-packaged meat chiller case, next to the smoked salmon. The package contains two cryo vac pouches of five thick strips of pork belly per pouch. The meat has already been cooked in the cryo vac by sous vide, needing only to get a quick sear in a pan before eating.
It is pretty darn good, and I have already made myself a couple of pork belly sliders and dicing it for use in a party appetizer. If I recall correctly, it cost about $ 13 for the package. Would recommend.