Groupon offers the Monster iSport Intensity In-Ear Headphones in Green for $39.99. Coupon code "G10" cuts that to $34.99. With free shipping, that's the lowest total price we could find by $45. These sweatproof headphones feature three pairs of antimicrobial tips, in-line mic, iPhone/iPad/iPod controls, and 10mm drivers. Coupon expires June 23.