E-Tech Distributors via Amazon offers Prime members the Kobra Professional Security Headset Earpiece for iPhone or Android for $7.99 with free shipping. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping costs $5.99.) That's $4 below our mention from three weeks ago and the lowest total price we've seen. (It's the best deal now by $4.) It's compatible with 2-way radios, MP3 players, and other audio accessories with 3.5mm jacks.