Ok, here it is. Sorry it took so long. I was in Anchorage for for a few days and then I spent the last few days in bed with the plague taking nourishment through a straw. Lotsa fun.
In the end we did not have enough time to go to both Walmat and Carrs/Safeway while we were in Anchorage so we just went to Walmart and then I had him calculate the difference between the two. It will give you a good idea of the difference in price in the two regions.
And to asnwer the question about baggage.....when you origin and destination are both within the state of Alaska, Alaska Airlines lets you have three 50lb checked bags for free.