After 3 weeks up there in June the short answer is yes, things are more expensive up there. Even more so when you get away from Anchorage and the grocery barges from Seattle. Gas is a dollar more a gallon. If you smoke, quit. A carton of marboro light is 90.00+dollars. There is no state sales tax although some communities impose a few cents.
The economy seems healthy up there. If they ever let oil developing go again, watch out. After 6 months of residency you become entitled to the oil revenue sharing, usually around 1200.00 a year.