You can get slices of san pedro legaly online and do a simple at home extraction or some type of ingestion method. Unless you're specificly searching for synthetic mescaline then well, ive never run across any synthetic mescaline sources.
^^^ agree most of the time its sold at around the same prices as other RCs, except a gram of 2c-i gets 40-50 doses, while a gram of mescaline gets 2-3. are there sources out there who sell mescaline at a more reasonable price?