Hi Vince,
Here are a few prices I found for king crab legs in Oregon:
Fred Meyer - sale for $29.99/lb
Costco - $38.99/lb
Albertson's - 49.99/lb

The market for king crab is particularly volatile this year because of conflicting pressures lowering both supply and demand for king, snow, and bairdi crab. The fishing season in the United States has been curtailed because of declines in crab populations, but there are also downward market pressures on price because of inflation and changes in the international crab markets. 
Here is a link to an interview with a crab wholesaler with Pacific Seafoods that has additional information and perspective on this.
Hope that helps, and wishing you a festive holiday season!
Cheers,
Amanda Gladics