Barry Bagels will serve you a "junior size" sandwich on any of their bagels for about $5. You can get get some nice group deals if you use their coupons, found on their website.
Soup and a sandwich deal is usually good. They tend to run out of popular soups shortly after lunchtime, so don't dawdle if you are in the mood for a particular soup.
The new rewards card program (launched spring 2008) is remarkable for its ridiculously poor return on investment. You have to buy 12 bagels to get 1 free. At Speedway they give you a free drink after 5 purchases.