A service that figures out how to create and deliver healthy (meaning not extremely salty, sugary, etc.), same-day-prepared, vegetarian-friendly meals for $10 USD per day or less. The service would make one or two dishes so that they can be prepared in batch (maybe one non-vegetarian, and one vegetarian), and deliver them at a predetermined time. The current services in this industry tend to cost a lot more than this and/or require you to do preparation yourself (i.e., they supply the ingredients only.) Even better: if you can accept the delivery soon after "cook time", you can get your meal warm, assuming it's not a cold dish to start with.

For people who don't, can't, and won't cook, and realize that much restaurant food isn't focused on trying to balance taste and health, this would be a great service. $200/month, 5 days a week. The logistics part seems feasible based on what's current in the marketplace; the economics are an open question.