I know that Cabela's uses some of the air taxi's up here. I also know that is not exclusive-in other words, I can book the same air taxi without Cabela's.
Just my opinion, but caribou are not all that hard to get up here. You could book yourself and save some money. Or talk to this guy
www.pristineventures.com
He is a hunt planner, and will get all of the detials worked out for you for about four or five hundred bucks.