Sennheiser writes their MSRPs, releases them to the public, then tells their retailers to sell the cans for half MSRP.
It's a sales gimmick.
The list price for these cans is $100 flat. Like most MSRPs, one can usually find them for under that. Don't let Sennheiser tell you otherwise.
They are quite decent cans for the price - you can get far worse for more $$, but they're a bit too dull for my tastes - Beyerdynamic DT770 pro's have turned me into a basshead, and these came nowhere near in that department.