Fastspring is a really great organization and ought to be utilized by more gamers.
Lulu is great for "pod" but is not .pdf friendly now. There used to be the issue with covers and now, as I understand it, you can't even sell .pdfs there anymore, only "e-books" which are designed to work in e-book readers like kindle, and have to go through a vetting and conversion process. I think the only regular pdf I still have there is the supplement I and I expect they will convert it to an i-store app' sometime soon. The 25 cent price difference really was just me anticipating the switch to "e-book" status when I put up Supp 1 initially.