Are there any projects that make use of those e-ink price tags that seem to be ubiquitous and maybe cheap(er)? Or are they locked to prevent their use for other

Are there any projects that make use of those e-ink price tags that seem to be ubiquitous and maybe cheap(er)? Or are they locked to prevent their use for other applications? Not sure if there's a good source for those e-ink price tags on a one-off basis that's down in the low double-digit pricing.