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.
Microsoft has the NuVision Solo 10 Draw 32GB 10.1" Windows Tablet (Blue, TM101W610LBL; Pink, TM101W610LPK or Silver, TM101W610L) for $89 with free shipping. Retail price: $249. Features 10.1-inch Full HD touchscreen, Intel Atom x5-Z8300, 2GB memory/32GB eMMC, up to 6 hours battery life, includes stylus and sleeve.
eBay has the Apple iPad Pro Wi-Fi + Cellular 256GB 12.9" Tablet, 2015 model (Silver, ML3W2LL/A and Gold, ML3Z2LL/A) for $780 with free shipping. Retail price: $1030. Features 64-bit Apple A10X Fusion SoC + M10 coprocessor, 12.9" Retina Display (2732x2048) @ 264 ppi, 802.11ac, BT 4.2, Touch ID, 12MP camera w/ 4K video (30fps), HDR & Quad-LED.
Has excellent Amazon Reviews.