I've heard there is no shortage of propane available, but the delivery/distribution system is maxed out due to high usage.
In Maine, propane is never a "cheap" fuel.
Makes sense, everyone probably burned a lot during the 'polar vortex' but then didn't get topped back off. Second cold blast hits and everyone is short on propane.
I have heard shipment by rail is not exactly a speedy process so for those areas where the local dealers get their shipments by rail they probably can't get additional propane supplies fast enough.