is there black friday deals for refurbished items

Apple has a constantly changing list of refurbished Macs: http://store.apple.com/us/browse/home/specialdeals/mac

Similarly, Amazon sells refurbs. With Amazon, if you use the Chrome or Firefox browser, you install The Tracktor, a plugin that not only tracks prices (new and used) over time, but allows you to set a target price, and receive an e-mail notification if the price falls below it.