A kind person posted this link in the
vintage_crime community, and I'm reposting this for anyone on my friends list who might be interested:
Munseys, books in the public domain available online, in ten formats, for free. R Austin Freeman, H C Bailey and G K Chesterton, among many, many others.
Only (tiny) problem is that the two places where I do the most of my reading is a. in bed, b. on the tube. Oh, well.