Money is tight and I need recipe ideas! Please?

I am 34 weeks w/#3 and we are temporarily living on one income. Produce is so expensive, and so are lean meats! We have a 2 and 5 year old, so it is a family of 4. We have been eating so poorly trying to save money (unhealthy food is SO much cheaper) and eating alot of the frozen banquet entrees (like the salisbury steak family size for $2) and I will but ground beef and chicken when it is on sale. We just can't afford to eat the things we used to eat. Do you know of any cheap but HEALTHIER meals for a tight budget? I don't want to have a 15 pound baby.... lol.