As one of its daily deals, Groupon offers the factory-refurbished Dell Latitude ST 10.1" 128GB WiFi Windows 7 Tablet
with free shipping
. That's $660 off list and the best price we've seen for any 128GB tablet. Features include an Intel Atom Z670 1.5GHz CPU, 10.1" IPS 1280x800 LCD (with Corning Gorilla Glass), 2GB RAM, 128GB SSD, 802.11n wireless, Bluetooth 4.0, 720p HD front facing webcam, 5-megapixel rear facing camera, 4-cell swappable battery and Windows 7 Professional 32-bit. Deal ends March 13. A 90-day Dell warranty applies.
Groupon also offers the factory-refurbished Dell Latitude ST 10.1" 64GB WiFi Windows 7 Tablet for $309.99 with free shipping. That's $270 off list and the lowest total price we could find. The specs are the same as above, although this features a 64GB SSD. A 90-day Dell warranty also applies.
Update: Specs corrected.