I haven't been over to see Troy at Bootleggers in a while. I should stop in. His hours suck for me so I can't usually get there during his hours.(I believe somebody said earlier his Sat hrs were 12-5, sorry, they're 8-12.) But he's knowledgeable and can point you in the right direction if he can't get something.
I've gone up to Brew-It-Yourself a couple of times. You can lose a lot of time there if you're not careful. Ed will let you sample stuff sometimes and his shop is a little bigger to wander around.
I was just up in NH last week and stopped by Jasper's Homebrew(sometimes known as Boomchugalug on Amazon), and Jeff is a great guy. If I'm ordering anything online, that's where I'm going from now on. His kits are fresh and he offers extract and all-grain versions of them.
I did find reference to a club in the Altoona area: Altoona Cap N' Cork Club. Anybody know anything about them?