Amazon has the HTC HD2 Windows Phone on T-Mobile for $99.99 (549.99 – 450.00) with Free Shipping when activated with new voice and data plan for a limited time.

The HTC HD2 has a 4.3-inch capacitive touchscreen, the largest on a smartphone in the U.S. It features a blazing-fast 1 GHz Qualcomm Snapdragon processor that runs on T-Mobile’s high-speed 3G network, Windows Mobile 6.5 with Sense UI, GPS navigation with trial version of TeleNav GPS Navigator for turn-by-turn directions, Wi-Fi networking, 5-megapixel camera/camcorder, Bluetooth stereo music, microSD expansion (with 16 GB card), Up to 6 hours of talk time, up to 480 hours (20 days) of standby time and pre-loaded entertainment apps with both Transformer movies.