Suaoki via Amazon offers its Suaoki 20,000mAh Portable Battery Pack / Power Inverter for $199.86. Coupon code "T5FRJXHQ" cuts it to $149.89. With free shipping, that's $50 off list and the lowest price we could find, although we saw it for $10 less last month. It features two AC outlets, two DC outlets, and two USB ports. Deal ends January 31.

Note: While the seller calls it a generator, it's really just a large power bank / power inverter that can be charged via a wall or car power adapter (both included) or solar charger (not included).