Dell Small Business offers its Dell Venue Pro 7130 10.8" 128GB Windows 8 Tablet for $449 with free shipping. That's $550 off list and the lowest total price we could find. Features include an Intel Haswell Core i5-4300Y 1.6GHz dual-core processor, 10.8" 1920x1080 (1080p) IPS touchscreen LCD, 4GB RAM, 128GB SSD, rear-facing 8-megapixel and front-facing 2-megapixel cameras, microSD card reader, USB 3.0, 802.11n wireless, and Windows 8.1 Pro 64-bit.
Of note, Dell Small Business also offers the same tablet with 8GB RAM and a 256GB SSD for $511 with free shipping. That's $625 off list and the lowest total price we could find.