I haven't looked within the last week or two as you have -- but when you consider that the 45xx series magazines have been in production from 1984 to probably 2014 or so... and consider the sheer volume of 45xx pistols made/sold compared to the Ruger P90/P97/P346 series, the most logical answer I can come up with is that if the pistol choice between the two brands has come to down magazines, NEITHER magazine is even remotely scarce.