http://www.necrophagia.com/idrink.html Here's the site for I Drink Your Blood. They are selling 500 signed copies. I ordered mine and got it within 2 weeks. The transfer is very good for an old film and it's just as corney as I remembered it from the drive-in.
There is an Easter Egg for "I Eat Your Skin" on the DVD.
There are unsigned copies now on Ebay direct from Grindhouse/Necrophagia for $29.00 each (plus $5.99 universal shipping) - that's the Buy It Now price.