i just came across this site
www.proxflyer.com

its got amazing micro heli's wieghing from only 2.7g
very small.

they all got videos and fly well.
unfortunatly they arnt for sale, but if they were i would buy one..
but since u cant buy one.. you can make one.

www.didel.com sell lots of small parts for indoor flyers
their site isnt great tho.