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B King via Amazon [amazon.com] has LISEN 5000mAh Ultra-Slim MagSafe Power Bank w/ 7.5W Wireless & 20W USB-C Charging (Glacier Gray) on sale for $13.29 when you apply promo code K8F6E3VU at checkout. Shipping is free w/ Prime or on orders $35+.

Note: Amazon promo codes don’t always apply seamlessly. If you run into this issue, try refreshing the page, re-entering the code, or checking after you select a payment method to confirm whether it already applied.