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Get one of those 36-48V scooter motors/controllers offa eh4y, a flip-flop hub, a rear rack, some mounting hardware, and three or four batteries from a junk yard. It'll weight a ton but it shouldn't be more than a couple hundred bucks and it'll go ~30-40 miles at 10mph w/ no pedaling. Just make sure it's geared right, both for the e-motor and you.
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