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20 cal

Maybe on the Vintage Auction sites. I might be a year or 2 off, but I think the last production ones made by Diana were back in 1997 or 1998. Someone who knows way more about Diana airgun history than I do should be able to say for sure.

Only options I know of are those auction sites and cross your fingers or have one custom built. You can also try Hector Medina at Connecticut Custom Airguns. He bought 60 LW barrels and got Diana to build 30 D34k Premiums and 30 D54's using them years ago and may still have a couple of the 34 .20's on a shelf. He's also mentioned the idea of using the new Diana 34 EMS platform to maybe build a few custom .20's since from the little I've seen, the new breech blocks are supposed to be easier to work with.

https://www.ctcustomairguns.com/