Dell's Latitude 10 tablet starts at $499 and runs a full version of Windows 8.
For $499, Microsoft will sell you its Surface RT tablet, which delivers a gimped version of Windows 8 designed for ARM-based hardware. It's fine for running apps and surfing the web, but it doesn't support full fledged Windows applications, not unless you step up to a Surface Pro slate. The two problems there are availability and price; you can't yet buy a Surface Pro, and when it comes out, it will cost $899 or more. This is where Dell's new Latitude 10 tablet has a decided advantage.