Is it too late to book a hunt for this year? If not whom should I contact.

You could Try Ceaser Lake Out of Watson lake..
they have a couple of late October Caribou hunts..

http://www.ceaserlake.com/hunt_rates.html

Watson lake

Here is a link to some Ceaser Lk. Pictures

http://www.ceaserlake.com/images/caribou1.html

Thanks!