Just got this email from Twitch with the subject 'Take an additional $5 off gaming gear and accessories'. YMMV.
For today only, Twitch Prime has created a Black Friday gaming store! You can visit the gaming store while logged in to your Amazon Prime account to discover discounted gaming gear, accessories, and more while supplies last.
Take an additional $5 off your purchase* by applying the one-time use promo code below during checkout.
*Offer expires at 11:59 p.m. (PT) November 24, 2017. Offer only applies to products and digital content sold by Amazon.com or Amazon Digital Services LLC (look for "sold by Amazon.com" or "sold by Amazon Digital Services LLC" on the product or content detail page). Products and digital content sold by third-party sellers or other Amazon entities will not qualify for this offer, even if "fulfilled by Amazon.com" or "Prime Eligible." Offer good while supplies last. Digital content and services may only be available to customers located in the U.S. and are subject to the terms and conditions of Amazon Digital Services LLC. Shipping charges and taxes may apply to the full value of discounted and free promotional items. Items must be purchased in a single order and shipped at the same speed to a single address. Offer limited to one per customer and account. The maximum benefit you may receive from this offer is $5. This offer is available to Prime members only. Amazon reserves the right to modify or cancel the offer at any time. Offer is non-transferable and may not be resold. Offer discount will be allocated proportionally among all promotional items in your order. If any of the products or content related to this offer are returned, your refund will equal the amount you paid for the product or content, subject to applicable refund policies. If you violate any of these terms, the offer will be invalid. Unless an Amazon Gift Card is the stated benefit of the promotion, promotional codes (including those placed directly in accounts) may not be redeemed for Amazon Gift Cards.
Link to the products: