Okay, a couple ideas.
Casseroles - Tuna noodle, chicken noodle, tater tot - All fairly inexpensive and will go a long way, especially with 2 people. You can freeze half if you want to or just make a smaller batch. With my gang, I make a heaping 9 x 11 pan full.
Rice, veggies, and chicken - Cook some white or brown rice, add a can or two of canned mixed vegetables (Veg-All or something like that?), season it to taste. Lay it out in a 9 x 11 pan, put chicken legs or thighs or quarters on top, and bake it. The juice from the chicken goes down through the rice and it's delicious.
Rice-a-Roni! Seriously, the cheapest side dish ever. I make a two boxes (out here they are a buck apiece) then bake some chicken and either cook snap green beans or use canned. Really simple and really cheap. You can use it as a side with a roast or hamburgers too.
Make your own meatballs. I usually do 4 pounds of meat and two packs of onion soup mix (Lipton or generic, it tastes the same). Bake the meatballs, then use them for spaghetti and meat balls. Use the leftover meatballs and sauce to make meatball subs. Get some fresh hoagie buns from the store, put the meatballs in, a little extra sauce, layer some shredded cheese on top, and bake for about 10 minutes. Nom, nom.
Make homemade pizza instead of store bought or take-out. My kids will choose homemade pizza over store bought any day. Buy the packets of crust, not the kits. I love Jiffy crust. You can top it with however much of whatever you like.
Breakfast for dinner. French toast, pancakes, burritos. We alternate. Breakfast burritos are a huge hit here.
I'll dig around for some actual recipes, but those are some quick ideas that are relatively inexpensive.