At greenmangaming.com. It activates on Origin. So you buy it from GMG and when the game comes out, it gives you a code that you throw into origin. It's just like buying from Origin but cheaper.
If you don't have an account there already and are ok with me having something when you sign up, here's my referral link:
However, that's not necessary. Here's the link to the website that's not my referral link, you're welcome to create an account through here as well:
Find the game Titanfall and use this coupon code at checkout:
March 7 is when the code expires.
*EDIT - I forgot to mention that coupon only works outside North America. Sorry Masterphu, I did know, I just forgot to say it.