Some shops I like are: Music Research Library (near the Park St stop), Vinyl Index (Somerville, in a neat little shopping area if you were looking for stupid gifts to buy folks), Good Taste Records (never been, but bought from them online), Tres Gatos (more of a tapas bar than anything, but there's a small music/book shop in the back--food and drinks are killer and JP is fun), Deep Thoughts (in Jamaica Plain but moving soon to Western Mass). Heard good things about Wanna Heart It and Want List Records in Watertown. There are other shops that have been around forever that'll show up in any google searches but these are some off the beaten path recs I think would be worth a trip.