Cheap keyboard for Garageband

Hi
I am new to Macs and just getting into Garageband. Can anyone recommend a good cheap keyboard (piano type) that I can plug into my Macbook and play in Garageband rather than use the laptops keys. I know nothing about them at all.
thanks

I use garagekey - a cheap USB midi keyboard.

I use this: M-AUDIO - KeyStudio - 49-Note USB Keyboard Controller for Mac Music Software

You can generally find them for around $100... even less if you look hard enough.