SmilePowo 51-in-1 Outdoor Sports Camera Accessories Kit | $18 | Amazon | Promo code TZTQ394A
Graphic: Chelsea Stone
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We see deals on third party GoPro accessory kits all the time, but even by our standards, $18 is a good deal; just use promo code TZTQ394A to get the lower price.  This set includes 51 different accessories, including harnesses, mounts, a monopod, and even a carrying case. This will also work with any other action cams with GoPro-compatible cases, including the Yi.