Microsoft must be in a giving mood this time of year or something. No its not free (too good to be true) but it is low enough to stop from breaking the bank.
On the market/store (whatever it is now) you can find some discounted titles, that usually have a high price.
All come in at .99 cents until the 31st.
Also Galaga Legions DX and Pac-Man CE DX are discounted at the moment at .99 cents but no timeline, so grab those quick before their gone.