Building a road bike from used parts vs buying a complete used bike?

I thought I should get myself a road bike by next years summer, and thought I should be looking for something used out of season. Would I be better off looking for a complete used bike or would it be even cheaper to build a bike from scratch, acquiring the parts individually. I don't mind the extra... show more I thought I should get myself a road bike by next years summer, and thought I should be looking for something used out of season. Would I be better off looking for a complete used bike or would it be even cheaper to build a bike from scratch, acquiring the parts individually. I don't mind the extra work.

Also, in case the latter is a good idea, I would appreciate suggestions for a commonly available carbon frame with a good reputation that I can look for to start the project.
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