For those of you in SE Michigan, I found the throwback at Busch's grocery store today. But even better they now carry Mexican coke, and it was on sale for $1/bottle, the 355 ml size. It was right up front by the coffee station with the free coffee, where they put sale items all the time.
The manager said they started carying it around Christmas, she didn't know if it was a permamnent addition or not. But the sale price is good thru some date in February according to the sign at my store.