I forced these people to trade games with each other to save money away from retailers.
Is this correct? I am not sure "away from" is correct, but can't think of a way to say it. It's like there's no phrase with the form "save money * retailers"
You could say: I forced these people to trade games with each other [in order] to save money by not using retailers. )
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You could say:
I forced these people to trade games with each other [in order] to save money by not using retailers.
(I am not sure about "forced." Do you mean "encouraged"?)