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.
Ends 7/31. GearBest has the Chuwi 10" Android/Windows Tablet w/ Keyboard (Gray) for $186 with free shipping. Features a 10.1" 1200x1920 touchscreen LCD, Intel Atom x5-Z8350 1.44GHz Cherry Trail quad-core processor, 4GB RAM, 64GB internal memory.
Staples has the Apple iPad Pro 10.5" 64GB WiFi Tablet (Space Gray, Silver, Gold, or Rose Gold) for $599 with free shipping. List price: $649. Features 10.5" Retina display, A10X Fusion chip with 64-bit desktop-class architecture, touch ID fingerprint sensor, 12MP camera with 4K HD video, 7MP FaceTime HD camera.
Microsoft has the NuVision Solo 10 Draw 32GB 10.1" Windows Tablet (Blue, TM101W610LBL; Pink, TM101W610LPK or Silver, TM101W610L) for $99 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.