All4Cellular offers the BlueAnt S4 Bluetooth Car Speakerphone for $54.95. Coupon code "A4C2A2" cuts it to $52.20. With $2 for shipping, that's the lowest total price we could find by $6, although it was $5 less last month (since expired). This speakerphone can be set up with up to two phones and allows you to place and answer calls while driving using only your voice. Other features include access to information services, A2DP streaming, and up to 20 hours of talk time. Deal ends February 8.