you mean "cash by mail" or in person?
Cash. Because of privacy. Either using nostr:npub1yul83qxn35u607er3m7039t6rddj06qezfagfqlfw4qk5z5slrfqu8ncdu or personal contacts.
Discussion
In person. I don’t trust cash by mail.
I might have to give that a try
but I think it is hard to find in person contacts
Bitcoin meetups are probably the best way
Yes, Bitcoin meetups and might look at existing offers in HodlHodl or create your own if there isn’t any. https://hodlhodl.com/join/Y5OI