A rebuilt one is cheaper, but can be more hassle.
The advantage of buying new is you don't have to deal with other people's stuff ups.
Remember you will still have to budget for an adaptor plate, jets, an air filter of your choice, possibly sundry fuel lines and a choke cable.
Last time I bought one of these new was 10 years ago, and it cost about $350. So $400 seems a good price.
Hope this helps,
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