I finally found them!
UG marbles!
I have been searching far and wide, including online, since being informed of their existence. Do you guys have issues finding marbles, because WHOA. I DID. There are plenty online which sell for a pretty penny, whether UG or not. The antique stores and peddler malls want a ton as well, usually for some new marbles in a vintage jar.
But today...today was DIFFERENT. Where do you think I found these?
ABOUT THREE MILES AWAY. 🤦♂️😭 OFC But they were fairly priced (IMO) save for one bag I did not buy ($29 for 10 marbles; 1 UG). Got these for $20. 🥳🥳🥳