After attempting to track down H2G2 toys through places like Toys R Us, Target and Wal-Mart, I have some news: The toys are being produced by NECA, who does a lot of movie collectibles. They tend to distribute through specialty gift shops and places like Sam Goody/Suncoast. Who wants to do a mall run?

http://www.necaonline.com/hhgg/ for Vogon Prop Replicas (limited to 1000 per item)
http://www.necaonline.com/hitchnews3.html
also see
http://www.martinfreeman.com/hhgg.php