Yes, the original edition of San Pedro Cool is sold out, not available on Amazon.com or anywhere except possibly as a used book. In fact, I'm looking for a few copies to buy for my files.
I'm working on a fully revised new edition, but I'm stuck with some other projects such as the new Fodor's Belize, out later this year and entirely devoted to Belize, and a couple of other guides. I'm also going to do a .pdf version which will be free for downloading.
Ambergris Caye is changing so fast, I don't know that any printed guide can stay current more than a month or two.
--Lan Sluder www.belizefirst.com