The Quantum is running $469.99 out of contract and as low as $.01 with new service ($199.99 if you're upgrading). Amazon will also throw in free two day shipping on the Quantum.
The penny sale does have a catch. The fine print reads,
"When you purchase your device with service from AmazonWireless.com, we automatically pass along an instant discount from the carrier to you. This discount has been provided to you based on your agreement to (a) activate a new, or extend an existing, line of service for this device with the carrier, and (b) maintain this service in good standing for a minimum of 181 consecutive days. If you do not activate or extend a line of service in connection with this device, or if your service is canceled/disconnected before 181 consecutive days, AmazonWireless.com will charge you $250 per device, plus applicable taxes.".
Regardless of the fine print, it's a heck of a deal if you're looking for a Windows Phone 7 device that sports a slide-out keyboard. You can check out all the purchase options over at AmazonWireless.