My sister Jenn sent me a link to tanga.com, a site that she's used before to buy boardgames. Their current extra special deal is 13 Dungeon Crawl Classics for fifty bucks plus shipping and handling. Dig it:
The adventures are all for 3.5 but that is an exceedingly good price.
EDIT: sold out!
An Introduction to the Ancient City on the Water
31 minutes ago