Not sure how it is where you are, but round here, there are a few reputable local bike shops which usually have a selection of second hand bikes, or might have a half decent new bike in stock - If you go that route, you've got the advantage that it's been set up properly and the makings of a good relationship with your LBS.
OR, look out for indie/vintage emporium type places - the one in Manchester, which (first floor, afflecks palace - if anyone's familiar with it! I realise it's no good the the OP) has a fairly steady stream of vintage road bikes - but then it's probably a good idea to take someone who knows bikes, because some of them can be ... well let's call them projects.
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