They were sold at my LCS and were called Donruss Gravity there. A member posted a Youtube video unboxing a Donruss Gravity hobby box on the 2020 Donruss page and said they were "Dollar General exclusive." However I made a post about this earlier and member C2Cigars wrote, "Yes, gravity feed boxes are just a type of packaging; like blaster, hanger, etc. They are NOT exclusive to any one store."
They were definitely sold at some form of Dollar Store like Dollar Tree, General, Family Dollar etc. but according to C2Cigars they would not be exclusive to any store and not be exclusive to Dollar General like the member who uploaded the video said, meaning they could have been sold at Target or Walmart. Like I mentioned earlier, they even popped up at my LCS.
My eBay store.- Be sure to check it out!
FOR SALE/TRADE: View my profile for details! If there's a certain player you want, ask me about them, I'll probably have a card of their's that I'm willing to trade but haven't marked on my FS/T list. For more specific info, visit profile or message me.