Groupon offers the AcousticSheep Noise-Blocking SleepPhones in three colors for $20 with free shipping. That's a buck under our September mention and the lowest total price we could find by $10. This fleece headband features embedded speakers that can connect to anything with a 3.5mm jack (iPod, iPhone, MP3 player, etc.) so you can listen to music while you sleep. They are available in XS, one size fits most, and XL. Deal ends December 7 at 1 am ET.