If you haven't yet eaten out in Harvard Square or are just wishing you could get more bang for your buck, take advantage of this week's BuyWithMe coupons. Every day this week BuyWithMe will offer a new deal at a Harvard Square business. Celebrating the Harvard Square Business Association's over 100 years existence, BuyWithMe—a Boston-born company—will also donate 5 percent of all proceeds to the Harvard Square Homeless Shelter

Today's coupon allows participants to pay $20 for $40 worth of food and non-alcoholic beverages at John Harvard's Brew House, 33 Dunster Street. In addition to the alcohol restriction, the voucher can only be used during one visit and does not include tax. Coupons from other participating businesses, including Fire + Ice, Nubar, Zinneken's, Tommy Doyle's, Jose Mateo Ballet Theatre, City Wine Tours, Regattabar Jazz Club, and "The Donkey Show," will be released over the course of the week.

Each deal can be purchased up to one week after the release date, and expires January 31, 2012. If you get two of your friends to buy it with you, you'll get the discount for free and have $120 worth of food from John Harvard's.