The Kobo version is a DRM free epub, so you can read it wherever you like. I'm still figuring out how/where to sell a PDF, because I really, really, _really_ do not like epub for technical books. It's ok for novels, at best. Tips welcome.
replyhttps://berksoft.ca/gol/genius-of-lisp-chapter-8.pdf has a free chapter.
Polar.sh's pretty easy to set up! It was originally built with selling download links in mind (for stuff like OSS software).
replyNot affiliated, just a happy customer.
I'm gonna check it out, thanks.
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