It’s still there going for $260.
Look, I got into collecting Becker’s later too. There’s a lot of cool stuff out there, but, if you’re going after some of the harder to find pieces (BK1, 6, 20, and 29) you should brace yourself for paying extra since these were all discontinued quite a while ago. I paced myself with those and snagged them as my budget (and wife) allowed.
Not owning the tougher to find ones shouldn’t diminish how you feel about some of the others that are more readily available.
Also, who knows, maybe they’ll be brought back some day. I sure hope so.