Ask HN: how to save on bandwidth cost for the distribution of a free game?

hello to all,

we are releasing a free game for mac and pc early next year. its file size is around 500MB. it would be available for free. right now we are thinking of hosting it in amazon s3, but after doing the math, the cost of bandwidth might become too high for us. we are now trying to find other ways of distributing the games. kindly share your suggestions?

could you also share to me your experiences in submitting to the mac app store? do they host your file or do you provide a link to your host? the same with the xbox marketplace, kindly share your experience? xbox marketplace also hosts PC games now.