There's not a direct source for such a thing. You'll have to check around your local salvage yards and what-not. As far as "reputable" goes.. There's no way of really knowing unless you take apart the motor.
Car-Part.com is my recommendation.
It will give you a list of those motors for sale and links to the salvage yards website. You'll have to contact them for details and see what happened to the vehicle that the motor was originally in. See if there's a warranty, and how long it has been sitting around.. Also ask about a compression test.
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