Third-party "bargain" sites often sell "recycled" or "pirated" codes. These can cause "Product ID" errors during listing or lead to your products being merged with unrelated items. Alternatives to Buying UPCs
Previously, GS1 was expensive (requiring a $250+ "prefix" for a bundle of codes). However, GS1 now offers single UPC codes for roughly $30 with no annual renewal fee, making them competitive with many resellers. buy upc codes for amazon
Most expert sellers and current guidelines strongly recommend buying directly from GS1 US rather than discount resellers. buy upc codes for amazon