Humblebundle has this deal on Final Fantasy titles for the remainder of the weekend, but there are loads of others available.
Cross platform if you buy for one your entitled to every platform they have available at no extra charge
They offer thousands of games, books, Mobile Apps, on the Humble Store with sales happening every day.
Every purchase supports charity. Choose your favorite from a database of over 20,000.
Check out with an account or as a guest. Pay with credit card, PayPal, or local options.
Avoid FFXIII-2. I bought it before and did not manage to pass the first 10mins without crashing. Checking from the reviews, this is a universal problem, unfortunately.
The good thing was I bought it from Steam directly so I could ask for a refund.
However, i doubt you can do the same for humblebundle (at least it will be a lot more complicated).