At your rate you should go vegan; better for yourself and the child. What about leafy greens and various salad with non creamy dressings like vinnegarettes; adding the veggies to the salad that you do like. Also grain experimentations. Quinoa (a small grain)is pretty cheap, filling and fun to eat, tofu dishes or tempeh (teriyaki style or with some soy sauce and added veggies)
check out www.vegweb.com
By avoiding the typical american diet of meat and dairy you open yourself up to so many more options and it will have a very positive affect on your child in varition from the typical child palate of hotdogs and macaroni and cheese!
with your crock pot you could also probably try out some curries (sweet rather than tradition spicy mexican)
what about nuts; just grab a handful and go; very nutritious and filling