Every Apple Watch owner should have two charging cables. One for their nightstand, and one for their luggage. It’s a very easy cable to forget at home, and if you find yourself on the road without a charger, it’s painful to march into an Apple Store and fork over $29 for a new one.
There haven’t been too many third party options to date, but this model from UGREEN is MFI certified, and only $21 today, a match for the best price we’ve seen. Just note that it won’t fit in most Apple Watch charging dock accessories, so you’re probably better off putting this one in your bag.