I have gradually come to the realization that the Twin Bing candy bar is one of those things in my life.
There are "vintage" candy stores in the Twin Cities which carry all sorts of random candy bars, but apparently none of them carry the Twin Bing.
Yes, I could order them online, but that seems like cheating.
Yes, they carry it at Minnesota's Largest Candy Store, but that's only open during summer and fall.
So I just keep looking for them when I find new candy stores. And I keep being disappointed - not surprised, mind you, just disappointed.
And, thus, the search for the elusive Bing goes on.