The Immortals and the AMBs have been discontinued - as in not being poured at the factory. There is still a supply of them available at their warehouse but no telling how long that will last. If you want an Immortal, now is the time to pick one up. I had a great second half last season with a Rico drilled Immortal Solid, so I will be picking up another one to stash away.
As far as I know, once a ball is on the Approved Ball List of USBC or the old ABC, it should be good to use as long as the ball lasts.
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I am the Sgt Schultz of bowling.
"I know nothing! I see nothing! NOTHING!"
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