I saw this potted plant at a local grocery store. It was USD $10 and there was only one.
Can someone identify this plant? Is it fast-growing? Does it have flowers? Is it indoor or outdoor?
Does it have any practical uses?
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It is Peperomia obtusifolia. I don't know what "fast" means to you, but I can say that you can keep it in this pot for a year before it will need to be up-potted.
Yes, it has "flowers" - the green stalk that grows upright from the clump of leaves closest to the camera in your picture. It is an indoor plant if the temperature outside goes below 15 °C (59 °F).
On a sidenote, it needs more water than other succulents, but still less than other houseplants, so don't overwater. If you overwater, the leaves at the base of the plant will turn yellow, so it's easy to find out what's the maximum amount of water you can provide to have it grow faster without killing it.