Sigh. The Sony software has that problem sometimes. A book looks like $0 when you browse the store, but then you find out it's $XX when you put it in your cart and try to checkout your freebie find.
I'll edit so that hopefully no one else gets disappointed.
Oh, and
Sandman Slim has been getting high praise over in MR's What Are You Reading thread in the Recs forum.
Night Shade Books offers as a promo freebie Richard Kadrey's earlier unrelated novel
Butcher Bird on their
downloads page, in case anyone wants to try his writing before they buy.
MultiFormat and DRM-free, and you can get more of Night Shade's books similarly via Baen's Webscriptions.