There’s many clones of the Parrot Rolling Spider quadcopter on the Chinese market and here comes another cheap alternative.
You can buy Weilihua WLH 08 for only 35$. It has additional wheels, just as the original one, so you can not only fly it but also ride the walls and ceilings. The range is 60 meters and you can fly in the height of 30 meters’ maximum. The accumulator with the capacity of 650 mAh needs two hours to get fully charged and then it can be flown for 8-10 minutes. I didn’t find anything about headless mode so probably it won’t be available.
Weilihua WLH 08 can be purchased on presale until 2nd July 2015.