Dual Shock 3 controllers can be purchased for less than full retail and run about $40-45 amazon also has a few bundled with games for the retail price of the controllers. OEM controllers are all the off brands that will work with the PS3 and are not the controller chosen by Sony for the PS3. Some are not wireless and others are not Bluetooth, but they are cheaper
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No, you can't use ps2 controllers to play ps3.
About 8 controllers
The system supports up to 7 controllers that are connected via Bluetooth 2.0 technology.
No. The PlayStation 3 doesn't have the PlayStation 2's input sockets for the controllers. However, Sony were planning to release a USB adaptor for the PS3 so that you could use your old controllers. It was never released, and is never being released in the UK, but I'm not sure about other territories such as the US or Japan.
Playstation controllers are made with SIXAXIS, a paticularly expensive technolgie but enhanses the sharpness and also lets the controllers last for 30 hours of gaming compared to the xbox's 8 hours of gaming