eBay has the Microsoft Surface Pro 3 Intel Core i3 64GB 12" Tablet for $450 with free shipping. Retail price: $799. Features Windows 10, 12-Inch Display, Intel Core i3 1.5 GHz Processor, 64 GB Flash Storage, 4 GB RAM, 1.76 pounds, 36W Power Supply and Surface Pen Included; Keyboard sold separately.
Has good Amazon Reviews, where it sells for the same price.
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.