I believe the gunshop you are refering to is at the Jacobsburg Historical Society. Don't remember all of the particulars, but they have a website you can check out.
Don't go to Landis Valley expecting to see great guns. There used to be a good collection there, but it is gone. There was a thread about it on the old board not too long ago. Some of them ended up at the state museum in Harrisburg, but they are not on display as far as I know. I emailed the museum to find out what you had to do to get access to them, but got no answer.
Weren't you considering relocating to the Philly area, Tom?
Dale H