How can I create simple text links to Amazon.com using UPCs?
To link to a product at Amazon,com using a UPC, you have a few options.
Using Amazon's Web Services (AWS) you can do an ItemLookup using a UPC to get information on the product including the ASIN. It only works if the catalog data at Amazon contains the UPC, so it works for most products. But there are some products that fall through the cracks.
Another method is to use the "Link to Search Results" tool in Associates Central under "Link to Any Page at Amazon.com" / "Link to Search Results". Enter a UPC as the phrase to search for and generate the link. Copy the URL from the resulting code. You can use the URL as a template because you can easily see the UPC in it and replace that UPC with any other UPC. Use this as a link to Amazon.com. It won't link directly to the product, but the product should show up first in the search results.
Here's an example URL created by entering the UPC 078636512822: