Outback Arms in Plympton on rt58, a mile or so north of rt44, has a selection of powder, projectiles, and tools, although I lack the experience to say one way or t'other whether their prices or selection is fair.
I was at Shooters Outpost on Saturday morning when they unlocked the doors, the sales guy on the reloading counter said they just took delivery of 130,000 projectiles. LOTS of Hornady boxes on the shelves.
They had six or eight Dillon Square Deal presses in various calibers, but no 550s or 650s. Sales guy said they get a steady stream of stuff from Dillon and to call if I'm in the neighborhood or before making a special trip.
I saw several Rockchucker Supreme single stage presses too, and some shotshell stuff.