You can buy a retractable extension cord reel like this for about $35…
…but if you've already got an extension cord, this $25 Wonder Winder looks like a better bet, though it's not as pretty:
Here's what it looks like in action:
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I like the simplicity of the design. The crank can be installed on either side, which lefties will appreciate. Each unit comes with two mounts, so you can move the unit between two different locations.
And yes, I even like the folksy my-grandpa-invented-this aesthetic.