Hi Matt. Yes Kens is surely missed. I live about ten minutes away from where the former site. I really wish it was still around.
There are a few good shops with N scale, both about an hour from Boston. Shepaug Model Railroad/halfpricehobby.com is in 23 Westminster street Ashburnham, but I haven't been there in years. Usually a great selection of n scale at shows. Also try Hobby Emporium in Tyngsboro right if US3 just before New Hampshire. Great selection, but prices are a year high. Lots of hard to find items though.