webcam or ??

i want to know can i go to say walmart and get a webcam that will work with this new mac mini i just bought. i want one that works as good as

the one that is in my imac. i want to use it for skype an such. the mini is set up in living room with big screen.

and yes i know about getting isight camera off of ebay but what do you get? probably junk...

thanks

bill