Retrospace is the gift that keeps on giving. It's real simple: I load scanned copies of comics into my Rapidshare account, and you download them for free. It just doesn't get much better than this. Sure, if the mood strikes you, I won't protest if you want to drop some change in the tip jar (in the sidebar). But, truth is, I do this out of the goodness of my heart....... and some unexplainable compulsion to share old stuff.
Anyway, here's some PDFs of a variety of horror/Halloween themed vintage comic books scanned and posted for your viewing pleasure. Enjoy.