Does the imac come with a wireless keyboard and a wireless mouse?

You mean the Magic Trackpad? The Magic Mouse does not require a mousepad to work because it works on almost any surface 🙂

If you buy it new, it comes with a wireless keyboard and mouse.

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iMac's come with a wireless keyboard and magic mouse, as the standard fare. So you don't need to pay extra for them. I would recommend purchasing rechargable batteries and a charger, as the mouse does chew through batteries.