He's absolutely right. They're not too common to come by.
http://www.gunbroker.com/All/BI.aspx?Keywords=Ruger+Super+Redhawk+Alaskan (59 listed as I type this)
vs.
http://www.gunbroker.com/All/BI.aspx?Keywords=Ruger+Super+Redhawk+Alaskan+454 (1 listed as I type this)
Buy Now for 1100 is the price in your second link...

