A barcode reseller purchase barcodes in bulk to be sold for a one-off cost to individuals for use on products. The numbers they buy are now outside of GS1’s control, and hence can be bought and sold without license fees etc. This means that they are much cheaper than other barcodes.
Warning signs of barcode resellers:
While many resellers are legitimate, there are some that are not. Watch out for companies that: Are hard to contact, Cannot product good evidence for the origin or their barcodes, sell barcode extremely cheaply, and haven’t been established long (i.e. they could disappear at any stage).