One of the all-time greatest classic modules is now available at DriveThruRPG.
S2 White Plume Mountain
I had an absolute blast playing this with my kids. They STILL talk about how they got Blackrazor.
DriveThru has a number of great files to go with this too.
White Plume Mountain Dungeon Tiles (lots of fun!)
White Plume Mountain Revised (3.5)
The PDF is the older mono-chrome cover, but I love this Jeff Dee one.