The English Language Book Exchange (and the Spanish one, too) are much expanded and open Monday through Saturday, 9-3 and 5-7 or so at Caftan Rojo in Coatepec. You can find an excellent map of the location here. It is on the corner of Zaragosa and Xicotencátl near the crucero on the Xalapa side of town. The telephone number is (228)8163151.
You can take a book (or two or three) and return them when you are finished or replace them with other books. Enjoy!!!