You can try steam.com, gog.com, itch.io, gamersgate.com, direct2drive.com, indiedb.com and many others. There are quite many up there and it is highly advised to check all of them to see which ones fit your needs. Revise the requirements and guidelines of each website before making any submission. Some platforms take a percentage of your profits. Generally speaking, the more you feature your game, the better!
Make sure as well to check (http://ConstructG.com) which offers free indie video game publishing and marketing services while allowing you to keep 100% of the profits.
Good luck with your game!
All the Best!