I remember, five years ago, in my beloved town of Nice, it was still possible to buy very fine records, (including top jazz rarities), in one of the three or four vinyl stores. I had good relationship with the owners, and was able to discover many interesting records. Also used to to trade ad sell some. All those record shop had resisted to the FNAC / VIRGIN invasion, because it was not the same market, obviously. But what made them eventually close was Ebay. For two reasons : one is that owners decided to sell the best stuff (if not the entire stuff) through internet ; other is that many non professionnal sellers willing to sell their records actually sell them directly through ebay, not to those shops. Everybody had good reasons to that, of course.
The "Marché aux Puces" de Clignancourt, in Paris, is still a good place to find interesting records, anyway. If if you shop every week, you will always find something for your taste. (If you accept to forget about any smile, or sympathy from a seller : we are in France )