I got my Samsung Chromebook for $140 from cowboom, refurbished though. It's a very good machine IF you keep in mind what it was designed to do. This is a minimalist operating system. Most everything runs through Chrome, but there are a few Chrome OS apps like a video player, calculator, Google hangout, etc. Very few Chrome apps are available right now through the Chrome store, but it's still early in the life of Chrome OS.
If you want a device to browse the internet, or do online work, then this is the device for you. The battery life is unmatched, and it is small and light and boots up in seconds. It has replaced my iPad.