If there are still leftovers the next day, I'll add a little flour, some diced onions and a beaten egg. Stir it all together, shape into patties and fry them for Fried Tater Patties.
I've also taken the left over boiled potatoes, cut them into chunks, and added other leftover vegetables, some beef broth or chicken broth, it's a personal preference thing, opened up a can of diced tomatoes and made vegetable soup.
Potatoes are the most versatile vegetable we have. It's a breakfast food, lunch or supper. You can make appetizers out of them. They are just the handiest item on the grocery list. Now that is how I save money on potatoes.
I can buy potatoes when on sale and not worry about them going bad. I watch ads for "buy one, get one free" and can usually buy 2 5 lb. bags of potatoes much cheaper than a 10 lb. bag.
Also if your family doesn't like instant mashed potatoes (like mine), I make mine half and half. It stretches my real potatoes a lot further. I started out using 1/4 instant and slowly went to 1/2 and they haven't noticed. I am also finding new side dish recipes for things less expensive. Or trying side dishes with potatoes and different other ingredients that help my potatoes last longer.
The last thing I am trying is growing my own this year. I planted some and they are coming up nicely. I hope this will save me a little on the groceries this year!
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Be sure your potatoes don't go bad. When they start to look that way, I cook them, chop them and put in a freezer container and freeze. They work nice to fry, put in soups, potato salad, anyway you like. I even use them to put in meat loaf. Sometimes farmers markets are cheaper too. Grow them yourself. I have a good sized plot of them in the garden.
The best way to store potatoes is to hang them in a cheap pair of nylon pantyhose. Drop one potato down into the toe, then before placing another potato in, tie a knot, drop the 2nd in, tie another knot. Do this 'till full. The knot keeps them from touching and the nylon allows them to "breath". Hang from a hook in cool dry dark room. When you need a potato, just cut open from the bottom, or you can untie the knots and reuse the nylon. This also works well for onions. They will keep for months!
For the potato pancake (using leftover mashed potatoes) I read that all you got to do is go get a baking sheet (I put parchment paper on my sheets) Just take a regular soup spoon take a scoop of potatoes and put it on the baking sheet when fill up or no more potatoes left. Take an egg beat it and brush on the potatoes and then sprinkle with paperika and bake at 350 for about 15 to 20 minutes until done. They are good that way and alot less messy.