It's been mentioned that the Astro Pis that are going to the ISS are (a) Model B+, (b) running a special version of Raspbian Wheezy, and (c) have special cases.
The cases are, of course, really out of the question to be duplicated or sold for anything affordable by mere mortals. The Model B+ are easy to obtain, so no issues there. Would it be possible to set up a download of the specific version of Raspbian that is going to be flown so that those on the ground who wish to demo the SenseHAT and talk about Pis in space could run the "proper" OS on them?