Currently marked down to 99 cents at Amazon: the omnibus of Robert Bevan's
Caverns and Creatures Books 1-4, as well as each of the four collections of short stories, aptly named
d6 through
4d6. The first novel is also 99 cents, but why buy it when you can buy the omnibus at the same price and get books 2-4 included for free?
The series could use some editing (as expected for indie work), and there's a lot of juvenile potty humor, but I've found the books well worth the read so far. The markdown is good for the next week, as a way to commemorate the publication of the fifth novel.
This series is based on what's become a common trope: a gang of roleplayers gets transported into the game world and transformed into their characters, and they then proceed to search for a way back. The big differences here are that they're more beer-and-pretzels types than Serious Roleplayers (leading to some early mistakes in what passes for their strategy) and that their GM remains In Control when he deigns to pay attention. It's definitely played for laughs, and won't be to everybody's taste.
I should point out that the short stories don't really fit into the novels' continuity. As I recall, the shorts work best when read after the second novel, as either a different path or as "untold adventures" taking place during that book. They're mostly written as ways to put the party into embarrassing situations, so don't think too hard about it.