All Solawave light therapy devices are BOGO free, including the $399 red light mask

GET UP TO A $399 VALUE FOR FREE: As of Dec. 9, all of the Solawave red light skincare devices are buy one, get one free as part of Solawave's Holiday Sale. Eligible devices range between $69 and $399, making your potential savings on the second device up to $399.

Red light masks were one of the most-searched products on Google this year, landing them a spot on Google's Holiday 100 list. If you've already clicked on this story because you've done that exact search before, chances are that someone in your circle has been red light therapy curious, too. The two of you should take advantage of Solawave's Holiday Sale slash extended Black Friday sale, where all light therapy devices are buy one, get one free. This is only while supplies last, and inventory of some devices is already dwindling.

That's inadvertently 50% off if you split the original cost of one device with someone else. If you'd be using your second device as a gift, you still just saved yourself a ton of money. We've named red light masks as one of the best gift ideas for moms and one of the best tech gifts overall — and since they're technically free, they'd beat most of our gift ideas under $50.

The biggest steal from the sale is clearly the Solawave Wrinkle Retreat Pro LED Face Mask, which retails for $399. I mean, consider the fact that other top red light masks barely went on sale for Black Friday: The Omnilux mask was only $75 off and CurrentBody mask bundles were only 10% off. My pick for the absolute best red light mask you can buy right now, the Shark CryoGlow, also went without direct discount. Sending a second $399 mask for free is quite generous of Solawave, especially if you and a loved one can split the difference and pay $200 each.

But if you're eyeing a slightly more affordable device, other popular Solawave red light devices are great options. You could get two of the viral Solawave Radiant Renewal Wand for the price of one ($169) or two of the Bye Acne Pimple Spot Treatment red and blue light device for the price of one ($69). If your under eye and crows feet areas are your major areas of concern, the Radiant Renewal Eye Recovery Pro is like a red light mask just for your eye area. Get two of those for $249 total.

Solawave's LightBoost skincare line is also taking part in the BOGO deal, like the ultra-popular Face and Neck Rich Cream and the Wand Activating Serum.