Rick Fielding is probably correct, in that it may be difficult to walk into your local guitar shop and find Clayton Gold flatpicks. It is, however, possible to find them from one of the online vendors, i.e., musiciansfriend.com, marsmusic.com, elderlys.com, fqms.com. I'm sorry, but I cannot remember, from which vendor, I ordered mine.
Yes, Fortunato, flatpicks have come a long way and there are other choices besides Fender Medium. Just as there are other strings, now, besides Black Diamond, which I think only came in Medium.