J&R offers the Sennheiser CX 870 Earphones for $29.99. J&R Rewards members receive free shipping. (If you’re not already a member, click here to join; it’s free.) That’s a $100 drop and the lowest total price we could find for this model. These headphones feature a 17Hz to 22.5kHz frequency response, ear adapter set, diaphragm guards, cleaning tool, and more.