Just a heads up for Canadians: Best Buy is offering a box that both Planet Terror and Death Proof will slide into with Grindhouse on the spine and I believe the posters of both movies on the cover. Future Shop has a steel book version of Death Proof available.
According to the ad, Best Buys in the U.S. are going to have Death Proof that comes in a steelbook package and has a bonus making-of featurette that runs 30 minutes (I assume that it's on disc two instead of being a bonus disc).