I want to add my first software product as an independent programmer to my Amazon store. However, they are asking me for an EAN or UPC code. I can buy one for about 10 pounds, but will one be sufficient for all my stock of 100 CDs (of the same product)? Or do I have to purchase 100 separate EAN codes?
You need one code for every distinct product. So for 100 identical products probably one code will be enough. But if you want to add an expansion pack or version 2.0 or anything else than the original, you will need new codes. Or you just keep selling them under the old code, but then the user can't distinguish them on the shops.
Also there has been rumours of free codes from amazon, according to amazon they are not true.