You can still find them at Cermark.com.
There are two newer larger ones available both with more scale detail.
You can try here [link=http://www.skygate-collection.com/cms-system/index.php?page=193]Skygate[/link]
and this one from Skymaster has video [link=http://www.skymasterjet.com/viperjet.htm]Skymaster[/link]
Mark