If you want an iPad--but you don't need the latest version--you may want to check out Apple's online store. Currently, you can find a refurbished first-generation iPad (64GB, Wi-Fi) for just $399. The units originally sold for $699.
According to the Apple Store, the $399 is a "special limited time price," which what retailers often say when they're trying to move back inventory. Considering how hot iPads are right now, it's likely the availability of the units will indeed be short.
All refurbished iPads sold through Apple's site have the same limited warranty as brand-new products, and you can also purchase an AppleCare plan, which gives you two more years of protection. Refurbished iPads on Apple's site come with all manuals and accessories, a new battery and outer shell, and they're packaged in a new white box.