B&H Photo Video offers the Motorola Roadster Pro In-Car Bluetooth Speakerphone for $24.99 with free shipping. That's $20 under the lowest price we could find for a refurb elsewhere. (This unit is new.) It features four microphones, Bluetooth 3.0, and up to 13 hours of talk time per charge.
Walmart offers the iLive On-Ear Headphones in Red for $6.88. Opt for in-store pickup to cut it to $6.74 and dodge the $5.99 shipping charge. (Amazon charges the same.) That's the lowest price we could find by $3. They feature a 3.9-foot cord and a frequency response of 20Hz to 20kHz.