Another deal from cdkeys Titanfall + pre-order DLC spotted on there fb page, looks to be cheapest at the moment. Use the 5% FB discount code to get the game for $47.50. Delivery is 24 hours before official release.
Website link: http://www.cdkeys.com/pc/games/titanfall-pc-cd-key-origin
Facebook Page: https://www.facebook.com/cdkeyscom
Edit: post removed :)