Amazon currently has a pretty killer deal on one of Anker's best-selling pairs of sport earbuds, the SoundBuds Curve. These are currently priced at $27.99 on Amazon, but when you use the promo code SXKQGYQG at checkout, that drops the price down to just $18.99, making this perhaps the best pair of earbuds under $20.
The Anker SoundBuds Curve is another great pair of sport earbuds from Anker. They now come in three colors - and the promo code does work on all three. It also supports the apt-X Bluetooth standard, so you're getting high-resolution audio out of these, with CVC noise cancellation technology, so they work well for taking calls. Anker does include a few sets of eartips in the box, so you can choose the pair that best suite your ears. Finally, the SoundBuds Curve do sport 12.5 hours of battery, and are also water resistant, though it is recommended that you don't go swimming with them. But they will work great for taking to the gym or on a run.
This item is also eligible for Amazon Prime's free shipping. Which includes free two-day shipping, and pretty cheap next-day shipping if you need it here extra fast. If you are not an Amazon Prime member yet, you can sign up for a free trial of Amazon Prime by hitting the link below. You'll get 30 days free (if you're a student, you get 6 months), and then it's $99/year. Prime members do get a whole lot more than just free shipping though, so be sure to check out the full benefits. While holiday shipping is over now, Amazon does also still offer extended returns for anything purchased before December 31st, can be returned until January 31st, 2018.