eXpansys offers the 1-lb. Archos 101 8GB 10.1" Google Android Internet Media Tablet, model no. 501590, for $270. Coupon code "LS15250" cuts it to $255. With free shipping, that's the lowest total price we could find by $5, excluding the price below. However, we saw this item for $5 less two days ago (since expired).
Features include an ARM Cortex A8 1GHz processor, 10.1" 1024x600 touchscreen LCD, 8GB flash memory, microSD card slot, 802.11n wireless, Bluetooth connectivity, front-facing webcam and microphone, USB connectivity, Android 2.2 (Froyo) OS, and more.
A close price: B&H Photo-Video has this for $255.26 with free shipping.