eBay has the Surface Pro 3 Core i5 12" 256GB Tablet (QG2-00021, Summer 2014)) for $550 with free shipping. List price: $1299. Features Intel Core i7-4650U 1.7GHz, 8GB RAM, 256GB SSD, 12" touchscreen (2160x1440), two 5MP HD cameras, Surface Pen, 802.11ac, BT 4.0, USB 3.0, Windows 10 Pro.
eBay has the Microsoft Surface Pro 4 12" 128GB Tablet (SU3-00001) for $580 with free shipping. List price: $800. Features Intel Core m3 6th Gen (Skylake), 4GB of RAM, 12.3" PixelSense 10-point touch display, 2736 x 1824 screen resolution (267 ppi), surface pen Included.
Best Buy has the Apple iPad Pro 10" 128GB WiFi Tablet four color options) for $600 with free shipping. List price: $700. Features 9.7" Retina display with anti-reflective coating, touch ID fingerprint sensor, 12MP iSight camera with 4K video, 5MP facetime HD camera.
Ends 3/28. GearBest has the Chuwi Hi12 12" 64GB Android / Windows Tablet (Gray) for $229.99 - $10 off with coupon chuwiGB3RD03 = $220 with free shipping. Features a 12" 2160x1440 touchscreen LCD, Intel Cherry Trail Z8350 (Intel Atom-X5 Z8350) 64bit Quad Core 1.44GHz, up to 1.92GHz, Bluetooth 4.0, Windows 10, and Android 5.1 OS.