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Lisen direct via Amazon [amazon.com] has 15W Qi2 Lisen Magnetic Portable Charger Power Bank (0.38″ Ultra Slim) on sale for $24.97 – $7.98 off when you apply promo code U79TMBS9 at checkout = $16.99. 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.