Groupon offers the AcousticSheep Noise-Blocking SleepPhones in Lavender, Grey, or Black for $23.99 plus $3.99 for shipping. That's the lowest total price we could find by at least a buck, although we saw it for $8 less in October. 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're available in XS, one size fits most, and XL. Deal ends May 30.