https://www.pcgamer.com/twitch-prime-subscribers-can-get-two-free-loot-boxes-for-overwatchs-newest-hero-wrecking-ball/

Twitch Prime subscribers can now claim two free Overwatch loot boxes full of cosmetics specific to Wrecking Ball (or Hammond, if you prefer), the shooter's newest hero.

If you're signed up for Twitch Prime—which is included in an Amazon Prime subscription—all you have to do is go to this page to claim your goodies. You'll be wanting one of his high-tier skins: I'm a big fan of the wooden one, which is third from bottom on this list of all his outfits.