Where can I find E-Bikes under $500? What is the best under $500? Link please?

Could you provide a link or at least tell me the best site to find ebikes that are under $500, and tell me what is the best? I know about the Ezip Trailz, but it is sold out on Amazon currently. And don't say "no such thing" or "not worth owning". Thanks for your imput!!!
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