My favorite book store is in an Argie style 'mall' They have a huge selection of English books. It is on the corner of Santa Fe and Pueyrredon. If you are on Santa Fe, you can just see it peeking out from the downstairs. It is on the same block as the Pueyrredon stop on the D line. The 'mall' has an antique shop out front, lots of 'Ferria Americanas' (Thrift stores), and a bunch of video game stores.