As of yesterday, Riley's had a fairly good stock of primers, as long as you're not picky about which brand you get. Down the street, Shooter's Outpost has increased their stock of reloading stuff, including small rifle primers, but I believe the primer prices were a higher than Riley's.
If you're around Sunday morning, there are a number of tables at the Manchester show with reloading stuff, including one with a dozen kinds of primers by the 1K box, reasonable prices.