Wireless Experts via Amazon offers the Jawbone ERA Bluetooth Headset in Silver for $34.72 with free shipping. (TechRabbit via Newegg and Tanga have it for about the same price.) That's the lowest price we could find by $5. It features NoiseAssasin 4.0 noise cancellation, a built-in locator, up to four hours of talk time per charge, and compatibility with the Jawbone app, which lets you program the talk button to access Siri or Google Now directly from the headset.

Update: It's now sold out at Amazon. TechRabbit via Newegg and Tanga offer it for $34.99 with free shipping.