Greetings!
Tempest happens to be a very common collectable game. You can find them all over the place on ebay. Usually there are a few at any given time, almost like empegs.
I agree - Tempest is
the classic to have, especially in the full vector format! If you ever decide to do this, I have a few board sets for Tempest here - at least two sets that I purchased as working. I collect (in case anyone missed that).
Also, if you are curious, a cool
Tempest site. A nice editor for creating your own levels, and a great history of the game.
A few others to think about are Major Havok (rare, but very compatible with Tempest) and Joust (just classic).