My understanding is that the Voyager was a private label brand offered by Champion. You didn’t have to be a Champion dealer, there wasn’t any exclusivity, dealer network, sales territories, etc… so any hardware or sporting goods store could sell them. (Scott did the same thing with the Corsair line and OMC early on with the Buccaneers, though that later changed to protected dealers and territories.) Likely you will find that old advertisments show many different retailers offering Voyagers throughout North America, not just the previously mentioned Woodbury Hardware.
This is different from private label brands that were offered though exclusive dealers – for Champion the only one I can think of is Sea Flyer offered in the BF Goodrich stores for a couple of years. Scott had a number of long-term private label exclusive contracts: Firestone and Hiawatha, Mercury with Western Auto and the Wizard brand – and of course OMC with the Sea King, Sea Bee, early Sea Flyers and several others.
The Voyagers are not all that common, I only have one photo in my archives from our 2008 Windsor CT meet – my son Graham and Cole B. hanging out next to a 5.5hp Voyager:
