Selling on Amazon Question

I am trying to put my software products on Amazon, it keeps asking me for either a EAN barcode number or a UPC, I dont have these, do you know where I can get these on the net?

Thank you for your help....

You can try this company:

http://www.gs1us.org/

Have your retail customers asked you to "buy a barcode for your product, synchronize your data with them or tag your pallets with EPC/RFID tags?" If so, then you're at the right place! From barcodes, eCommerce, and data synchronization, to EPC/RFID, and business process automation standards, GS1 US is the trusted source to deliver innovative products, services and solutions for business' most pressing supply chain challenges.

This is from their site and I've searched a bit and everyone points to them.