These are places I have tested with JAWS for accessibility, and all of them are very easy to use. Some have some minor issues, which I will highlight.

Ritual Magick
Carries candles, incense, burners, charcoal, books of shadow, some crystals, jewelry, divination tools, ritual garments, athames, books (in print), DVD’s, and other tools . Descriptions are reasonable, check out is easy. Certain things may be larger or smaller than expected, but everything is high-quality. Some pages have headings to navigate by, others don’t. Check out is straight forward.

Howl at the Moon Gems and Jewelry
Crystals, stones, some jewelry and candles, among other things. Site is easy to navigate, check-out may be somewhat difficult when selecting the state you are from and choosing Paypal or credit card. If you wait and try a couple of times and it doesn’t work, you might need someone to use the mouse, unless you have VoiceOver. I will discuss this with the owner, with whom I have a long-standing business relationship. If you call, the store owner is extremely helpful in describing stock.
Update: as of the last time I placed an order, I had no difficulty with checkout.
Star Woman Crystals
Easy to navigate, but somewhat expensive. Assistance over the phone is excellent.
Sells a wide variety of every tool, plus some fun stuff. Easy navigation, easy checkout, great customer response.

The store Sacred Power Of Witchcraft is fairly navigable. However, checkout can be difficult and I encountered resistance asking for help.

Another thing I recommend is seeking out smoke shops, places like the Candle Barn in local malls, or places that sell mineral specimens for other processes. Make sure to cleanse whatever you purchase from these places. Another good resource if you know Pagans with sight is someone within your community who makes candles. They can be more descriptive. Rock tumblers are relatively inexpensive (usually around $40 if you get a smaller one).
Stores like Spencers sometimes sell pentacle jewelry.