The Scream Blu-ray Collection is already available for purchase on Amazon. The 3 disc set is encoded for region 1. Just click on the ad in the left to see more details.
There is also a cool canadian set, with Ghost Face on the cover, that I´ve found on eBay. For this one, you gotta be fast because there are only 2 of them left.
Other option is to buy only the first one, that is the one that I have and love, here! And then, just enjoy the wonders of high definition at your home.