Agree with using meat as a flavouring rather than a main component of a meal, as well as eating some completely vegetarian meals, so make meals with small amounts of meat sliced up and mixed in with vegetables, pulses, grains etc rather than a whole chop, steak, chicken breast etc per person.
As your motivation is cost saving rather than ethical or environmental, also looking at using cheaper cuts of meat like pork cheeks, pork belly, liver, a gammon joint, pork or lamb shoulder or brisket. A slow cooker can be invaluable for cooking these types of meat - I got one for £7 from Asda, but this was during 'new student specials' week.
At the risk of mentioning the Mumsnet chicken etc, this really is the way to make your money go further and make healthier meals as they include less meat and more veg.
If you have a chicken - only serve the breasts as a roast, with lots of vegetables. Then use the legs and thighs in a pasta bake, curry, or pie, again with vegetables too. So two meals instead of one.
Similar for gammon - sliced up with either vegetables or egg and chips. Keep some leftover to chop up and put in a macaroni cheese, with broccoli and/or green beans too.
Leftover lamb shoulder or brisket can go into shepherds or cottage pie. This is the traditional way of making a joint last most of the week. Serve less meat with lots of veg, and then plan to have leftovers for the next day or two.