I believe Snitches Get Stitches is sold out. I really admire his work but never actually bought that one. Snitches Get Stitches was something he sold as a souvenir to people who attended his shows a while back. While you're missing out on a Dan Sperry video and probably some interesting material, it's probably inclined more toward the layman than "us." Probably. I might be very wrong.
The only other dvds I can think of are his dove videos and "Always Remember to Floss." There are also his video downloads here at Theory11, of course.
If you follow him on Facebook or Twitter then he might have some news of future projects there.