Looking for deals on an XB1 500GB system

Hi, I'd like to look for newer deals on a Xbox One 500GB system. It doesn't matter if it's new or lightly used. I just needed to find a way to buy one as I'm upgrading from a 360 I recently sold on Amazon. Can someone help me with this? Thank you in advance.

I recently got interested in buying an XBOX one or a PS4 so I''m also looking for advice!

MS is practically begging people to buy XB1 consoles. They are preparing for two new systems in 2016 and 2017. Deals:

https://www.cheapassgamer.com/topic/356491-best-buy-dotd-75-gift-card-free-game-with-select-xbox-one-consoles/

https://www.cheapassgamer.com/topic/356450-xbox-one-console-bundles-349-500gb-369-1tb-at-amazon-includes-50-gc-2nd-controller-halo-5-le-fh2-and-more/