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HGSST via Amazon [amazon.com] has for Prime Members: 2-Pack Lerat Rechargeable Electric Hand Warmers (Black) on sale for $11.99 – 42% off when you apply promo code C39I6HYH at checkout = $6.95 ($3.47 each). Shipping is free.

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.