The cost and wiring to power eink displays is too much, due to the USD being fairly stable, prices don't change daily/hourly, which would help eink signage for shelving make sense.
You essentially either need a power drop to each section of shelving, or you have to replace batteries on every sign through your store every X months or years.
You essentially either need a power drop to each section of shelving, or you have to replace batteries on every sign through your store every X months or years.