It's the 260th Semi-Hemi-Super-Decimation Sale at John W. Doull (1684 Barrington Street, 429-1652), that amazing bookstore at the corner of Barrington and Prince. Here's the deal: buy 10 or more books and get 50 percent off the marked prices, even more in some sections. (This does not include internet stock, oh web-savvy customers. You must enter the store with your feet to take advantage.) And there are daily specials. On Tuesday it was vegetarian, 25 percent off. (Presumably that means books about vegetarianism rather than books sans animal products.)