Newegg offers the refurbished Digital2 4,400mAh Portable Battery in Purple, model no. RP-4400F_MPL, for $11. This $11 mail-in rebate cuts it to $0. With $1.99 for shipping, that's tied with our March mention and $17 below the lowest total price we could find for a new one. It includes a microUSB to USB cable and features an LED battery status indicator. Rebate expires June 3.
A 90-day warranty is applied, although it's unclear who backs it.
Prefer a different color? It's still available in Gold for the same price via rebate, as we first listed five days ago.