As one of its daily deals, 1Sale again offers the Vizio 1080p HD Active 3D Rechargeable Glasses in Black, model no. VSG101, for $19.99 with free shipping. That's tied with our October mention as the lowest total price we've seen. (It's a current low by $20.) They're designed to fit over a pair of prescription lenses and feature up to 24 hours of battery life per charge. Deal ends today.

Note that this item has an estimated delivery time of 1 to 2 weeks.