Since I always want to read books in english, I wrote to Barnes and Noble, and asked wether or not they ship them here to Bs. As. and YES they do!
And since books here are way more expensive, I compared prices with the US. and its even CHEAPER to order one from B&N and have it shiped here, even by paying some extra because of it. There was one book that I brough back with me that was 15 dolars, and here they sold it at 250 pesos, so if I wanted it send it to me, it was something around 140 pesos at the end!