when they say it's 7 chinese dollars for $1. it's not like you can get $7 of good for 1 american dollar.
I've been to Hong Kong and China and the quality you get is piss poor on DVD. If your going to buy to get some blu ray your missing the point. Blu Ray is for high fidelity viewing. You don't want a clearer version of a handy cam image. Trust me. It's not worth it.
Sure you might get some DVDs for like $3 but it's more than likely going to be a VCD labeled as a DVD.
Now games, games over there are cracked like crazy. I got a funny stare when I bought a real game there. funny stuff.
Also, if you ever go. Learn the word "cop". It will be very useful. I heard that word and had to jump out of the store as it closed in like 30 sec.