I have used Amazon.com (or, more recently, smile.amazon.com if one wishes to have some tiny portion of one's purchase dollars go to the charity of one's choosing) as a site when I'm training folks to use JAWS for a very long time now.
It was, at least through last fall, very accessible, and if memory serves once one does a product search the individual products returned are all structured as headings, so it's easy to use the headings list feature of JAWS to cruise through those quickly and easily (or use the quick navigation key for headings).
Brian - Windows 10 Pro, 64-Bit, Version 1903, Build 18362
Many of the insights of the saint stem from his experience as a sinner.
~ Eric Hoffer