Check out the Humble Bundle (it's out for the next 7 Days).

https://www.humblebundle.com/

If you pay more than the average, you'll get Origin Keys for:

Battlefield 3
The Sims 3
Dead Space 1+3
Mirrors Edge
Crysis 2
Burnout Paradise
Medal of Honor

There are also Steam Keys for: 
Dead Space 1
Mirrors Edge
Medal of Honor
Burnout Paradise 
Crysis 2