How do I add a fourth USB port to my iMac?

I want to be able to use four, USB game controllers on my iMac. I have only three USB ports. How do I add a fourth port?
thanks!

There's an extra port on Apple USB keyboards. For something like a game controller, that should work for one of them. If you remove the mouse while gaming, or get a wireless Bluetooth mouse, then there are two USB ports on the keyboard. If the remaining ports are not enough, then you'll have to get a USB hub. You should get one that has it's own power supply, rather than a cheaper one that is powered only by the connection to the Mac.

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