Posted By:
MiguelThere is exactly one good card shop anywhere within public transportation's range, and you're lucky that it's right near the financial district. Check out JJ Teaparty's:
http://www.jjteapartysportscards.com/
I don't think they have much pre-war, but they have plenty of post-war vintage and are run by some great guys. This card shop remind me a lot of the ones I used to visit before they all went away. There is another shop on the same street, but it is much less nice and is not dedicated entirely to sports cards.
As for sox tickets, the best bet is almost always Craig's List: http://boston.craigslist.org. In any normal season, you can expect to pay 2x face value for non-Yankee games, and probably a fair bit more for primo seats. Stub Hub is OK, but they seem to start at 3x to 4x or more, so I have never used them.