The best deal in town today is not only good for your pocketbook, it is a book. Today begins the Friends of the Lafayette Public Library’s book sale. For three days, March 12-14, the main branch of the library on Congress Street will offer sweet deals on all kinds of literature, non-fiction and maybe best of all, vinyl records. There’s always a find, from the Tim Gautreax short story collection I picked up last year for a quarter, to that oddball Maria Callas recording to round out your opera inventory. Hours are 8:30 a.m. to 7:30 p.m. today, till 5:30 p.m. on Friday, and until 3:30 p.m. on Saturday. Check out the library’s Web site, or call 261-5761 for more information.