Thanks for all the replies, info and comments folks.

God really smiled on me today. Just for kicks one day last week I asked at a local store I frequent if they have any of this ammo.

Today I was there again and the owner found TWO 20 round green and yellow boxes he had stashed away. He said years ago he had one of these and finally took the ammo home ‘cause there was no call for it. I was able to buy them both at non-panic / non-pandemic prices.