For all you ridin'-in-the-dark commuters. I got a coupon code from TMART that allows you to get a valve cap light for free. This seems better than some of the other reflectors/light options I've seen.
Link to light
Just type in the code when you checkout and you'll be billed $0.01. for the item.
I might have to get one myself...
Mtbr's 2016 Winter Biking GearReviews and Roundups
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Thread: Valve Cap Light Deal