Ground base control/live stats system

Anyway, What's the cheapest arducopter ever built? Like chinese frames & custom designed shield...
& have you heard about www.goodluckbuy.com? I AM PLANNING TO BUY FROM THERE, BUT AFTER READING REVIEWS I FEAR. ????
PLEASE HELP.. whats the cheapset and the best website to buy online components like arduino,rc motors,controller boards,etc??

-Rahul