Products purchased directly on this website will provide a different kind of purchase code in the form of your transaction ID which is included in the payment receipt you receive from 2checkout or Paypal. (layerswp.com)
People are always reselling these codes on eBay or giving them away on reddit, so you could theoretically get them a lot cheaper, but as it is with purchasing codes anywhere you'll need to be very wary in order to not get ripped off. (monamiibo.com)