Porter's Camera Store sold self-adhesive DX-coded labels, but now they're closing, I don't know of another source.
there is a camera store in the UK who makes some, they will not send them out of the country, but Someone I know from a mailing list was kind enough to get some on my behalf. Unfortunately they are poorly designed as far as having a positive way to locate them and they are so thin that I doubt that they will last many cycles. Also they were quite expensive even if just the UK price was taken into account.
Charles MacDonald email@example.com
I still live just beyond the fringe in Stittsville