You should be able to find these at walmart. Probably online. They were a gift but my son is already huge so I only kept one pack. I didn't think to ask.
I just looked walmart sells them. I'm not sure if they are in the store. My aunt got these for me and she does most her shopping online. I used them with my other two kids when potty training. It sure helped with them not messing on the couch. Lol.