Groupon offers the Monster Diesel VEKTR In-Ear Headphones, model no. 129557-00, for $39.99 with free shipping. That's $5 under our April mention and the lowest total price we've seen. (It's also a current price low by $7.) They feature a ControlTalk universal cable with microphone and volume controls, and multiple ear tips. Deal ends July 13 at 1 am ET.