Don't throw away your old potatoes. When the eyes start growing out, you can chop them in half or thirds and put them into a sack of soil to regrow. Here we used a large 20 pound cloth rice bag (bag only) filled with soil. We cut the potato in half, dug it into the middle of the soil, covered it with more soil, and left it in a sunny area outside and made sure to keep the soil moist. After six to eight weeks or when the sprouts are three to four inches tall, add more soil. After a few more weeks, keep checking your soil (poke around with your fingers) to see how your little potatoes are doing. When the leaves turn brown and start collapsing (some varieties bloom flowers), the potatoes are ready to pull out. :)
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With grocery prices rising everyday, I try to find every possible way to save on our food budget. I had a few potatoes which were starting to sprout...