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There's a great Github project for building your own Splitflap/Solari displays from the ground up for $20 each https://github.com/scottbez1/splitflap

Right now it's focusing on 40-character flaps (not super convent for clock-making), but it's open-source so I'm sure you could modify it for your purposes with some effort.

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That's just for the enclosure. It looks like it comes out to 60-70$ depending on how you build it. I'm targeting sub $50, but it's tough. Good resource though, didn't know about those cheap geared stepper motors.

followup: actually I went to the the builder's youtube video and they're claiming $25~$30 per module. so pretty good.

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