We drink a lot of decaf and I email roasters before ordering to see what method they use (even though it's stated that methylene chloride is "totally safe"). It seems most commercially available beans are processed via this company: https://en.descamex.com.mx/ (which does both: https://en.descamex.com.mx/mountainwaterprocess)

Even our local coffee roaster replied and said they only use Swiss water process on their more expensive organic beans - the rest of their lineup uses MC.