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I picked a bunch up online a couple of years ago. But the bookmark is on my computer that is in storage.
Here is one site that has the square rhinestones:
http://www.artbeads.com/loose-rhinestones1.html
Try searching swarovski rectangular rhinestones to find the rest.
Most of what I see at the Michael's and AC Moores are too large for HO or 1/64.
The ladies at Dreamtime Creations stock an excellent selection of miniature round, square, and rectangular rhinestones. I bought clear ones by the gross. I use them, and you've seen them.