You may find some places selling barcodes for pennies, one example are eBay sellers, but this would not be wise. There are lots of vendors who sell barcodes which are not legitimate and cannot be traced back to a legal contract prior to 2002. One way to check if a barcode seller is ...
You can also apply for a GTIN exemption if you sell private label products or bundles, meaning that you don't have to provide a UPC code if Amazon accepts your submission. To be eligible for GTIN exemption you need to meet certain criteria: ...