I use Mal's E-commerce on my sites which I find amazingly good. The only real problem is adding and maintaining many items so, for a friend who runs a crystal shop, I developed a table code creator where you add the items for sale in an easy page, then copy & paste the code for (in her case) up to 122 items in one fell swoop. I followed this up with a form-select spreadsheet, but this is not used as much.

For small numbers of items, there is a code creator on the Mal's E-commerce site. (we share the same forename, but we aren't related!)

M