There are scales and look-up tables for the produce out in the produce area (the look-up tables are also programmed into the scales but the UI is slow and tedious).

So you gather your, say broccoli, look up the PLU code (it also might be on a sticker affixed to the item), put it on the scale, enter the code, and the scale prints out your bar code that you scan.

I'm a dozen miles north of Boston, MA.