The iPad 2 was first released in 2011 but Apple has continued to sell it for a discounted price as many educational and business customers have opted for the cheaper full-screen iPad, and it is the only iPad that Apple sells that has the legacy thirty-pin connector.
The original-generation iPad mini has been available for the $299 price as well since the Retina model was introduced back in October. It has the same processor and a smaller screen than the iPad 2, though with an identical resolution.
Article Link: Wal-Mart Offering New 16GB Wi-Fi iPad 2 for $299