This mini quad, its amazing for indoor flight.

http://www.amazon.com/Cheerson-2-4GHz-6-Axis-Quadcopter-Bright/dp/B00KHGXDMO/ref=sr_1_2?s=toys-and-games&ie=UTF8&qid=1432773304&sr=1-2&keywords=quadcopter

Whoa, I actually have one of those things.

The best part? It's ~$18 on amazon, with free 2 day shipping if you have amazon prime:

http://www.amazon.com/Cheerson-2-4GHz-6-Axis-Quadcopter-Bright/dp/B00KHGXDMO/ref=sr_1_2?ie=UTF8&qid=1433124224&sr=8-2&keywords=quadcopter