It goes for 50 on newegg, +5 bucks shipping.
BUT! Around 20 new on AMAZON.com
I have one, and it works great, great range, it doesnt heat up, and its usable on any pc, if you really need to use it on anything else.
Pen Drive ones are good, but they heat up horrible, and have poor reception.
PCI ones are good too, but only good for Desktops.
This is the way to go IMHO