Heres another:-
http://www.sourcingmap.com/mp3mp4-c-981.html
If you want to avoid hacked memory then Rockchip players are a safer bet and are good value for money.
Since it's a "soft" hack I guess it must happen somewhere in between the factory and the seller, probably a wholesaler.
If your customers are in Europe might want to check that you get the right mains adapter too!
If you are looking for better quality MP4nation will do a deal for you too:-
http://mp4nation.net/catalog/index.p...7d423df625ff43