Go to rewards.xbox.com and sign up they give you Microsoft points for purchases on the microsoft store and xbox live
However, pre orders do not count unless it is a thing for "my missions"
I've gotten over 200,000 points back (200 dollars)
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I play Xbox. I also hardly buy new games and when I do I prefer a HC that I can resell either online or trade in at a store. I games that are on sale through the console though, most of those aren't worth it to try trading in.