"Spiegelman, Sacco and Clowes don't seem to fall into that category."

No, and I don't know if every B&N in the US would have those, although they'd probably have Clowes' Ghost World because it was made into a film and possibly Spiegelman's Maus because it got so many positive reviews in the mainstream press.

Queen & Country is fun stuff. I highly recommend it. Rucka has also done two Q&C novels that fit into the ongoing storyline. Both are good page turning yarns.

Rucka says he blatantly ripped off a lot of the ideas for Q&C from a British tv show called The Sandbaggers, which ran for three years in the late 1970s. If you've seen it (I have not) then perhaps you can get an idea of what it's like. It's also a bit like the American show Alias, except better.