I don't know about cheaper, but certainly more available. You can just buy these memory lcd displays commercially. I think it probably takes a lot more work to procure actual e-ink displays. I believe the jump drives you're talking about do use e-ink, since they are completely unpowered when disconnected and don't contain batteries.
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Was this cheaper than real e-ink or what?
Do you know if this is what is done for the displays on jump drives as well or are those true e-ink?
I don't know about cheaper, but certainly more available. You can just buy these memory lcd displays commercially. I think it probably takes a lot more work to procure actual e-ink displays. I believe the jump drives you're talking about do use e-ink, since they are completely unpowered when disconnected and don't contain batteries.