Houdini Museum in Scranton report that Kino's Houdini The Movie Star DVD set is now discontinued. Indeed, the Kino store shows "discontinued" on the DVD homepage, and Amazon shows a 9 to 10 day waiting period (although Dorothy and Dick said when they tried to order from Amazon, it comes back as unavailable). The set was first released in 2008.
If you haven't yet gotten this set, I'd make every effort to do so NOW. Amazon's Marketplace is still a good bet for new and used copies. While Houdini's movies are all now available on multiple DVDs and streaming, this set contains a wealth of archival footage of Houdini's escapes that doesn't exist anywhere else. It also includes The Grim Game plane crash footage, and several minutes of Houdini's very first film, Merveilleux Exploits du Célébre Houdini à Paris (although the set doesn't credit it as such).
Thank you Dorothy and Dick.