Groupon offers the AcousticSheep Noise-Blocking SleepPhones in three colors for $17 plus $4 for shipping. That's the lowest total price we could find by $19. 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. (We suggest Chopin's Nocturne No. 2, the soundtrack to A Little Night Music by Stephen Sondheim, or "Fear Of The Dark" by Iron Maiden.) They are available in XS, one size fits most, and XL. Deal ends September 12.