Caribou herds have fluctuated from what they were even a few years ago. If you want to hunt the Mulchatna herd I suggest Papa Bear Adventures out of Bethel, everyone that has used them that I know has been extremely happy. I wouldn't recommend trying to access that herd from Anchorage or the Kenai Peninsula (Soldotna, Kenai, Homer). The herd is ranging too far away to be consistantly reached from those points. Another good bet is to hunt the Western Arctic herd out of Kotzebue but my contacts up there have retired since my last trip up there for moose. Ask around on the Alaska hunting forum: http://outdoorsdirectory.com/akforum/