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You can get displays from Adafruit for $22 [0] or from Waveshare [1] even cheaper if you're willing to do a little more work. I've used both and they're both pretty nice.

[0] https://www.adafruit.com/product/4777

[1] https://www.waveshare.com/product/displays/e-paper.htm

Oh the display is only like $4-6 on Alibaba. After you add the resin and my custom PCB it's like $20 at the low scale I'm purchasing.

Actually, the cards already have magnets in em, so these would work on your fridge already.

But you need a base station to update them, and a way to connect to your network to upload images/text.....

If you email me your address, I'd be happy to send you one for your fridge :D