One of the best ways to get a discount on an iPad is to buy a refurbished unit at the Apple Store. Refurbished iPads come with the same warranty as a new iPad and are discounted anywhere from $30 to $150 from the original price. The only problem: they are not always available.
The iPad 4 has been missing from the refurbished store since its release, but now the 16 GB 4G model has made an appearance on the store. This model sells for $579, saving $50 off the full price. Unfortunately, that's the only model currently listed, so those wanting to save a little money on a 16 GB Wi-Fi model will have to wait.
The Apple Store is also selling a refurbished 16 GB 4G iPad Mini for $429.