Saturday is the semi-annual 30% off everything sale at Hobby Emporium in Tyngsboro, MA, just south of the New Hampshire border. (I’m not affiliated with them, and they aren’t even “my” LHS, but it’s a very good day to shop and there will be a small crowd outside the door when they open. Relax. It’s not Black Friday at Wal-Mart.)
They are well stocked in both N and HO scales. They have a very large inventory of Cornerstone and freight car kits, which is nice to find in this era of RTR. In addition to trains, they carry model aircraft and ships, and probably tanks and such, too.
I’m going for trees and scratchbuilding supplies, mostly, but I’ll likely come home with a few more freight cars to put on my to-be-built-sometime shelf.