Buy.com offers the IOGEAR Bluetooth Hands-Free Car Kit
, model no. GBHFK211W6, for $26.99. This $7 mail-in rebate
knocks it down to $19.99
. With free shipping
, that's the lowest total price we could find by $6. It features a portable speakerphone for in the home, in the office, or on the road, a purported 30-foot wireless range, and is VoIP compatible with Bluetooth-enabled computers.