I got them online, not sure if I can put the url here so PM me.
I saw the ones that were at Walmart and like alot of things Wally World carries they are not the same quality. The Walmart ones just use the cams and pins that are common with prefab furniture that thread into the MDF itself. The one`s I got use a pin with a tapered Set screw, The pins are threaded into steel inserts that are moulded into the panels. I was skepticle upon ordering them and figured I would return them if I thought they were weak. The panels are PVC coated MDF and alot harder, stiffer than other MDF I`ve seen. The floor is VCT.