I always have comic book scripts lying around that I'd like feedback on. Sometimes I have comic book storyboards that I'd like feedback on.
My scripts read like movie screenplays and are not the finished product, so please keep that in mind. I've had beta readers who didn't understand this and left pretty useless feedback, and I'd hate to waste your time. Therefore I prefer readers who are fans of screenplays, scripts, comic books, etc, not just novels and prose. However, no prior beta reading experience is necessary.