The NASA Galileo Project is offering a free model of the Galileo Spacecraft that you can download from the Galileo site free of charge, print onto your own card stock, cut out, and glue together. The extensive assembly instructions are on the Galileo web site. That's an assembled downloadable model in the image at right. Model kit designed for the Galileo Project by Dave Doody. SCI won't be offering one, because Mattel Inc. has exclusive rights to commercial models of Pathfinder.
Image shows an assembled model.
The NASA Pioneer Project is offering a nice, free model of the first spacecraft to leave the solar system. Here's an image of the completed model. The instructions are all on the web site. Here's a pair of models of the Advanced Composition Explorer designed by Jan Heirtzler. It's on the to the University of New Hampshire Space Science Group's site .