There's also the Old Black Witch books, and the Erica Frost books like "I Can Read About Ghosts" and "I Can Read About Witches". All of these com e up quite often on ebay.
That's where I found mine. Not a bad price there either. Here's some auctions now:I tried to find those Erica Frost books but since they are so old they're not made anymore. I saw them on ebay, I might try that out.