I haven't used them myself, but they are made by Lighthouse. They can be pricey ($49.95 retail) but if you can get them at a reasonable price, I see no problem with them.
Here is the note on one Alligator ... about $20, with shipping ...
Alligator Classic No. 2A red-orange stockbook 16 double-sided black pages 8" x 11.5". There are 10 rows of acetate strips per page with double glassine interleaving. This is a new condition book put away many years ago by someone who wanted quality. Made in West Germany.
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