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Here's a 3 rpm unit, maybe the one you've seen already:
http://www.goldmine-elec-products.com/prod...p?number=G15492
Transferring the rotation from the motor unit to the sign is the trick. How to do it without spending too much money though. Here are some shaft couplers from another site. A little more expensive than I'd like to see, but you'd need only one. Reduce the gear motor output shaft to a smaller shaft (music wire or brass) that will fit inside your sign pole, and there you go. If you want a lit sign, it's a bit more involved.
http://www.servocity.com/html/clamping_shaft_couplers.html
http://www.goldmine-elec-products.com/prod...p?number=G15492
Transferring the rotation from the motor unit to the sign is the trick. How to do it without spending too much money though. Here are some shaft couplers from another site. A little more expensive than I'd like to see, but you'd need only one. Reduce the gear motor output shaft to a smaller shaft (music wire or brass) that will fit inside your sign pole, and there you go. If you want a lit sign, it's a bit more involved.
http://www.servocity.com/html/clamping_shaft_couplers.html