Not the best design for a stamp, but its nice to see him recognized. I highly recommend the March graphic novel (its sold either as a single book or three separate volumes), which he helped write. It’s a very good overview of the civil rights movement, and touches on some of the things that are usually skipped.
In my supermarket they are mandatory. You get your fruit and you put them in a scale which prints out an sticker with the weight, pricing and barcode, which is what os scanned at checkout.
This would be all avoided if they had scales at checkout and the clerk used them (which would also reduce fraud) but of course is cheaper having way less staff.