Logitech K810 Bluetooth keyboard comes with automatic lighting and costs $100
The keyboard is compatible with Android 3.0, iPhone and iPads running on iOS 4.0 and Windows 7, Windows 8, and Windows RT. Basically, you need to have your device supporting the keyboard profile HID.
The keyboard supports up to 3 devices and you can switch between them via a dedicated button in a second. The Logitech K810 keyboard price is set at $99.99.