The San Francisco Book Company is small, but perfectly formed. It has a good selection of mainly second hand books that are not as expensive as I expected (i.e. comparable with the same in the UK). There are several shelves of poetry that you have to bend over to browse, but luckily there is a stool provided for those with bad backs. Jim Carroll is a friendly and informative book seller. Go there (in the 6th - 17, Rue Monsieur Le Prince), buy books.