eMallGroup via eBay offers the Unlocked Samsung Google Nexus S Android Smartphone for T-Mobile, model no. GT-I9020T, for $289.99 with free shipping. That's the lowest total price we could find for this phone without a contract by $167. (We saw it with 2-year contract for free in August.) Features include a 4" 800x480 AMOLED display, 5-megapixel camera with autofocus and LED flash, 720p video recording, 802.11n wireless, Bluetooth 2.1+EDR, microSD card slot, 16GB internal memory, AGPS, microUSB connectivity, up to 14 hours of talk time, and Android 2.3 (Gingerbread).

Of note, although this phone is listed as compatible with AT&T, the description states that 3G support with AT&T is not supported.