One of the best places I have found has been the Value Center Marketplace at 27428 Six Mile Road, Livonia, MI 48152. I was tipped off during a Faygo Book presentation at the Redford District Library.
Not only did the store have a great variety, it had great prices. I bought 2-liters for a buck. The store had 12-packs of cans as well as singles in the 20- and 24-once sizes. Just look at this beautiful Wall of Faygo.
You can see a list of more than 100 Faygo flavors over the years in “The Faygo Book.”