First off, yes, I know that there are AVG replacements from Mark
Spaeth and Alex at Elektronforge and I'm not trying to steal anyone's
thunder. That being said, I have access to a few NOS (brand new)
pieces.
These are used on the Atari color vector games (Gravitar, Space Duel,
etc) except Tempest which implements it's own AVG. The only downside
is the price, they ring in at $20/ea.
They're also considered NLA (no longer available) and are *extremely*
hard to find but I'll get some on the way if there's enough interest.