Groupon offers the Duracell 8,800mAh PowerMat Long Haul Portable Charger Power Bank, model no. PCSB1, and the Duracell 1,850mAh PowerMat Day Trip Portable Charger Power Bank, model no. PBRLB1, for $22.99. Coupon code "VISA5" cuts it to $21.84. With $3.99 for shipping, that's the lowest total price we could find for both bought separately elsewhere by $85, although we saw them for $3 less three weeks ago. They both feature wireless charging via any compatible PowerMat surface (sold separately).