Pisen Direct via Amazon offers its Pisen 2-in-1 Rechargeable Hand Warmer and 7,500mAh Portable Battery Pack in several colors (Silver pictured) for $25.99. Coupon code "WK6LB4GB" cuts that to $19.49. With free shipping, that's tied with last week's mention and the lowest price we could find now by $10. It heats up to 122°F in about 30 seconds and provides a constant temperature on both sides for three to five hours on a full charge. Features include a 2-amp USB charging port and 1-hour auto-shutoff. Deal ends January 19 at 7 am ET.