I am pro frozen vegetables... I am usually in a state of poorness for many various reasons :S so I am also on a budget, I think bags of frozen veg is a bit cheaper than fresh stuff and you can store it for longer, I do believe I read an article on frozen vegetables being fairly good for you,obviously fresh off the branch or out of the ground is the way to go but there's no guarantee that the stuff on the shelves is really that fresh so I guess frozen can sometimes be better(I think you would have to investigate which brands are best for preserving the nutrients).. and like the other fellow said chicken and rice are pretty good and cost effective and you can jazz up the rice pretty simply, with a tin of baked beans/mushroom soup or my favourite, scooby doo pasta shapes :S...i think that might be pretty hard on the salt intake though but I really do sweat a lot !

Porridge/oatmeal is good and filling too, but it is easy to go crazy with adding salt and sugar to that