This is along the lines of stretching your food budget just a bit............
I occasionally make salt potatoes. I always make the entire bag & would put them in the fridge for leftovers. Like so many other things, they eventually got tossed. I finally started cubing the leftover potatoes, laying them on a cookie sheet & freezing them. Once frozen, I toss them in a ziploc freezer bag & use them for fried potatoes.
I have also started boiling, cubing, freezing & "bagging" potatoes that I know are starting to get old instead of tossing them. This keeps from wasting food & also saves money because instead of buying hash browns, tater tots or frozen french fries, I just pull out my cubed potatoes & either pan fry or oven bake them for dinner or even breakfast.
For leftover bread I've done the bread crumb thing, but how many bread crumbs can you have????????? We always buy fresh loaves of bread each week - white & wheat - even if the previous loaf is not gone. I hated throwing it away because it wasn't moldy or anything - just not fresh. I began freezing the leftover bread each week & now use it for french toast or grilled sandwiches when we have them.
Of course, these ideas will only save a few pennies/dollars at a time, but a few pennies/dollars here or there can add up!