Bargain electronics store Computer Geeks has a great deal on a USB VOIP Handset. It sells for $39.99, but you get a $39.99 mail-in rebate (valid until 1/31/06), making it a for free deal.
The generic brand AU-100 Voice Over IP USB Phone connects via USB 2.0 and features full duplex communication, noise reduction and echo cancellation.
It is for sure not the best VOIP PC handset, but its free, just do not forget to mail-in the rebate form.
This VOIP phone is fully compatible with Skype, Vonage soft phone, Net2Phone,X-Ten, StanaPhone, SJPhone, MSN Messenger, AOL Instant Messenger, Firefly and eyeBeam.