The device was first released in October 2013, starting at $399. Buying the refurbished model saves you $60 on the 16GB Wi-Fi version. The 32GB Wi-Fi version is discounted from $499 to $419, a savings of $80 and the 64GB Wi-Fi version is discounted from $599 to $509, savings of $90.
Currently there are no cellular versions listed in Apple's Refurbished Store. Hit the link to check availability.