iMac Supplies Becoming Constrained Ahead of Potential Refresh

9 to 5 Mac reports that multiple sources, presumably resellers, have noted that supplies of the current-generation iMacs are showing as "constrained", limiting restocking orders. The development is a common one as Apple draws down supplies ahead of the introduction of new models.

We have been told by three people familiar with the matter - all in different countries including the U.S. and an Asian country - that iMac supplies are tightening.
As noted in our Buyer's Guide, the iMac is due for an update given that it has been nearly nine months since the last refresh of the line took place in late July.

Last month, CNET's Brian Tong claimed to have received information from a source indicating that updated iMacs should debut by the end of April or the first week in May, a window of time that is just now set to open.