Just buy from people on eBay. I've always had the best luck there because you can check their feedback. I'd never buy from anyone with less then a 99% feedback score.
People will go way out of their way to keep those high scores because that's what attracts buyers. Especially big ticket stuff like engines.
I've bought 1 1jz, 1 SR, and a used motor for my old accord from random ebay vendors. Never had a bad experience yet.
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