If you like Ramen Noodles and want something similar, look around in the Int'l section of your grocery store. Some of the 1-serving thai noodle packets are much healthier. You can also try soba noodles which you can cook up in a microwave. If you like canned soups, there are plenty of healthy options and if you look for sales and use coupons you can get lower-calorie frozen meals pretty inexpensively.
I tend not to eat most processed foods, so I prefer things like salads, pita sandwiches, tuna, or I often make enough of our dinner meal to have "planned leftovers." It's usually not very expensive to add a serving or two to the suppertime meal & it gives you lots of variety at lunchtime.