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Specifications mostly u need to look for:
Distance:10m or 100m
Supports: Windows 98/SE, Windows2000, WinXP, Mac OS 10.1 or above
Maximum data transfer rate: 1Mbps
Package Includes:
USB Bluetooth Adapter, USB Cable, Installation CD
Brands: Transcend, D-link
I suggest you to have a look at ebay and u will get an idea of available brands.
Overall Specifications of USB Bluetooth Adapter
Bluetooth Specification V1.1 compliant
Full speed USB interface, Compatible with USB 1.1
Connect up to 7 different enabled Bluetooth devices
Encryptions and authentication ensure safe, secure communications
Low power 1.8V operation
Bluetooth 2.4Ghz Wireless Technology Transceiver and baseband
Distance: Connections within ranges up to 400 feet (80Meters)
Connect up7 devices in a Pico net.
Antenna: Integrated inside the adapter
4dbm(Class2) Bluetooth radio
Sensitivity: -80dbm at 0.1% bit Error Rate) BER0)
Security: encrypted link, authentication
Maximum data transfer rate: 1Mbps
Supports: Windows 98/SE, Windows2000, WinXP, Mac OS 10.1 or above