This is an excellent deal for a very warm jacket.
EMS online has limited sizes, but local stores may have more. The Acton, Mass. store had most sizes in stock as of last wednesday (Jan 23). Call your local store and ask them to see which stores have your size in stock.
It seems to have more loft than the Rab Neutrino Endurance I looked at there and the catalog weight is only 2 oz more.