Hey, Robertb, you guys should consider offering Paypal and Google Checkout as other payment options. I know a lot of people who use those two services a lot.
Oh, and a side note, the 12 book novel series you're referring to (ie, the DreamLand Articles) isn't actually 12 books. It's actually a series of short story anthologies, each of which contains 12 short stories.
Right now I've only got 4 books in the series (one released, one pending, and two on the work table), just to clear that up.