Green Ronin offer a PDF for $5 when print products are preordered either directly from them or via game stores (sometimes it takes some burueaucratic wrangling for stores to get those preorders set up).
I overcame my anxiety and had a quick chat, thanking him for his publications and showing general appreciation for the Green Ronin content I've enjoyed over the years, especially Dragon Age. Seemed very nice—perched there on a tall stool looking ever so slightly alone.
He was sharing a stall with Fanboy 3 I think. Asked him about the system behind the updated Blue Rose and he kindly explained it; sounded nicely straightforward so I bought a copy, but forgot to ask about PDFs at the time. I'm going to email Green Ronin and Fanboy 3 to see if anything can be worked out, because those PDF prices are pretty steep if you're buying the book as well.