You can get two battery-powered rechargeable, self-stirring coffee mugs for just $3.30 right now in White or Brown at AliBaba (they’re $1.65 each, but you have to buy a minimum of two). Shipping will add $12, so you’ll need to count that into the price (though it’s still cheaper than what you’d pay for two similar mugs at Amazon). You can alternatively choose two USB-powered model for $4.40 (or mix and match).These mugs use a sensor to stir drinks automatically without needing an outlet. They’re made from stainless steel. Buy Now at Alibaba