There's an Albertson's next to where I work, the deli there has some pretty good deals. Food averages around $3/lb, the soups are even cheaper. I usually pick up a $1 Sobe Lean with whatever I get.
I go to Quizno's pretty often too, if somebody else from work wants anything. I use the Xbox Diamond Card coupon (buy one get one free)... a large sub runs $7-$8, I usually only ask for $5 from 'em, so I get my sub for $2-$3 depending on what it is. And with subs, water is perfectly fine.