Aside from buying family packs and freezing individually....menu planning is HUGE in saving money and minimizing waste.
For example.....I can cook a roast chicken dinner....traditional style (with mashed taters and carrots and corn). (roast chicken for 2) From what is left, I can make a half dozen chicken enchiladas, (a few mushrooms and green peppers to fill them out)....which I freeze individually. There is also enough chicken left to make a nice hearty chicken soup......and the left overs from THAT can be thickened to make a full sized chicken pot pie....or 4 small individual chicken pot pies.
That's a lot of mileage out of one roast chicken.
The same can be done with roast beef. Traditional....French dip buns.....beef pie or shepards pie.
(and roast pork too)
Roast pork.....leftovers cubed for sweet and sour, rice and veggies......pulled pork buns.