I've picked up some terrific inexpensive pressbooks over the years -- mint condition Mesa of Lost Women, Unnatural, Horror Castle, and a slew of European Paul Naschy titles being my prides and joys -- but I think my greatest coup was the paperback "novelization" of Orgy of the Dead by Ed Wood for three dollars. I was at a convention a few months afterward and mentioned it to a dealer who was practically salivating at the prospect of my selling it to him (which I didn't). Nothing will top my scoring Dean Owen's adaptation of Reptilicus at a used book store for a quarter, though.