Despite online stores and Apple retail stores reporting healthy supplies of iMacs a report from 9 to 5 Mac this week that multiple sources have said that iMac stock is showing as "constrained".
The three sources are all reportedly from different countries have said that constrained supplies has made restocking limited.
The iMac which was last updated in late July 2010 was in March rumoured to receive an update in "4-6 weeks", a timeframe that we have now entered.