If the problem is just the wording, what's the big deal? Just change the description of the item by removing the part that advertises it as a cure for this or that illness. The witches' claim that spells are the same as prayers and that therefore this is a case of religious discrimination falls apart when one considers that:

But the FTC draws the line at objective claims: specific promises for specific, measurable, tangible results.

In 2007, the FTC took action against Daniel Chapter One, a so-called “health & healing ministry” that sold herbs and other “Biblical remedies” for cancer. Despite the company’s insistence that it was faith-based — their Web site still describes them as ministers who oversee a “home church” — the couple behind it was indicted on a string of misdemeanors last year, largely related to the claims about cancer.

So this has nothing to do with faith, it's a matter of regulations that affect everyone equally. Slightly off-topic: I can't believe there are witches and priestesses making money by selling magic spells. I wonder if you have to get some kind of license and pass a test before you can call yourself a witch, or if having a tumblr page is all the requirement you need.