Found this on a site that sells Japanese Merchandise called Jbox. I found they're going to sell miniature models of classic Sega arcade machines (I think they're classic; I don't think I've ever actually seen any of these machines in a real arcade.) They have Space Harrier, Hang-On, Out Run, Thunder Blade and sone secret machine type. Here's the link:
http://www.jbox.com/SEARCH/taikan
Maybe some of you will find this of interest. I might order a set myself.