Dedicate a shelf in the freezer to individual portions of soup. It might be quite 'samey' for the first couple of weeks but for example, if you work for five days a week try to make enough soup for at least six portions so after a few weeks you can mix up which soups you are eating each day.
Ta da healthy and very filling lunches, and if you are not fussy and make your soup based on what is cheap in the supermarket/grocers that week it can save you even more money. If you don't do a lot of cooking soups can also be a nice fairly easy place to start as well.
Not season appropriate perhaps but during the festive season a lot of butchers do really good deals on big bundles of meat and if you have the freezer space this can often be enough to provide meat for your festive meals, and in our case because there are only two of us this can provide enough meat for most of January which is so often a hard enough month without grocery bills. It's also means we can eat a nicer quality of meat than we can usually afford.
Also I've found that if you ask the supermarket butcher for bones for stock, gravy, etc you can end up paying a few pounds whereas if you go to your local butcher they will often give you them for free.
After a roast chicken dinner you can use the carcass and the peelings from your roast carrots and onions to make the base of a delicious chicken noodle soup with things you would just bin otherwise.
If you eat a lot of mince I would recommend trying veggiemince; in something like lasagne you can't even taste the difference and if you aren't sure about it you can use it to bulk out regular steak mince and I would be surprised if you were able to tell
. I've certainly done that when I've had a lot of people over for food and no one has ever noticed. Again it's not just cheaper it's also healthier and I like the fact that I can cook it from frozen if I have forgotten to take something out the freezer to defrost.
I've just noticed these are all food related. I clearly think with my stomach... No wonder the diet is stalling out.
ETA: just noticed Abbey had already me mentioned bones and stock