Check out necn.com for project half price. I've purchased a number of half price certificates that I've been happy with. Offers are available on Fridays at 8:00 am but can sell out quickly. The WRKO site also has half price offers.
Groupon has some good deals. I think I got turned on to them by Chowhound? I currently have 1/2 price coupons for Dave's Pasta and place in Milton that just opened. There is a food offer about once a week.