When I was in my first job in my early 20s, I made it a mission to spend as little on lunch as possible. I ate canned tuna, ramen noodles, etc. I'd be happy with spending under $20 in a month. One of the things my boss at the time told me is that as you get older, you are more concerned with finding healthy options than worrying about how cheap it was. As I march through my 30s, I totally agree with him. While I don't want to spend $7-10 a day on lunch, I do want healthy options.

Over the past 6 weeks, I have drank Soylent for 2 meals a day (I usually skip weekends). It's a 400 calorie meal replacement drink. It provides 20% of your daily nutritional requirements, so it's not meant to replace all of your meals, but it can replace a lot of them. Soylent ingredients include isolated protein from soy, slow-burning carbs from beets, and all essential vitamins and minerals.

After getting a box to sample, I signed up for a 48 bottle a month subscription. You can get a box of 12 on Amazon for $34.00 (original flavor). They also offer a Nectar and Cacao flavors to mix it up a bit.