often on ebay or roadie sites like classic rendezvous or resprayers like argos or builders like bob jackson. I've had luck with all of these in the past!
Have looked into this before as it's the major thing holding me from respraying a frame that has all original stickers on (including warning labels abour the qrs and the forks) but all they seem to make now are golf clubs if you go to their site... have found one guy though who supplies the tubing so maybe he could help...
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Reynolds still supply them - though they'll only supply what they have left if it's an old or discontinued tubeset. A digital photo of the old transfer is handy so they can compare what you want with what they've got.
If thy have no old ones left they'll send one that says "Reynolds 531 renovated" or similar.
I think from memory they charge about £4 or so, but this was a few years ago.