$15 Amazon credit for Twitch Prime members (which includes Amazon Prime members) after you buy one of these games:
Last of Us Remastered, PS4, $17.98
Sims 4, PC, $39.99
Fallout 76, PS4, $17.00
Starlink Battle for Atlas, Switch, $29.95
Gears of War 4, XBONE/Windows, $9.89
so if you buy the last one you get a free game and a $5 credit.