I'm sure there's some guys on the board that can get them. Normally I recommend Monsters in Motion for the helmet and rocketpack kits. The helmet kit runs about $200 and is a bargain at that price IMHO. The rocketpack kit is expensive - it's about $1,000. It's just an extremely difficult kit (and very big kit) to create and takes a lot of time and materials. Most casual fans aren't interested in spending that kind of money on a kit or hiring somebody to finish it for them though... That's why not many folks have them.
Your show off brings back a lot of memories--big fan of the movie and that era of aviation. One of the first costumes I made for my kids was a Rocketeer helmet and backpack--funny thing was, most people didn't even know who/what he was??.. I might have some pics of it somewhere too.