The small ones like a 450 which is what that guy is flying can be had for like $600 for a knock off one, for a good one (which you would want for this type stuff) it would be more around $1000. I have a bigger one thats 700 size (6ft rotor span) that should be able to lift like 10lbs and that one cost me $2000 to get running and I bought it second hand. Some of the really good ones go up into the 20-30k range and run on turbine engines and everything. I guess it just depends how much you want to lift and how much control you want over things (like a camera gimbal, video down-llink, stabilization ect...)
Oh, and they are not easy to fly, its all learnable but this guy that shot the video above is very good at flying.
