I recall a thread recently about flipbooks, and as luck would
have it, I happened to be in a toy story today that stocked
all manner of flipbooks and optical toys. I bought Edward
Muybridge flipbooks of elephants walking and horses galloping,
and a wonderful toy called a phenakistascope.
The company that makes these is at www.opticaltoys.com, and
it looks like they sell retail from their website, though I couldn't
get the catalog as the website wasn't responding or somesuch.
(A few months ago, I also found some Calder mobile flipbooks,
but I don't think it's the same company... I'll check if anyone
wants to know)