I visited several of the markets at St-Ouen and Vernaison ended up being my favorite. It has pretty much everything honestly - from trinkets to jewelry/fashion to furniture, art and everything in between.
Once inside, it's a literal maze of stalls to explore. You could spend most of a day here, no problem. There's a ton of high end stuff but also a fair amount of reasonably priced things that are easy to bring home - vintage linens, silver flatware, books, jewelry and much more.
Now, these are experienced dealers so you're not going to get a real Chanel bag for $100 but I did think many of the prices were affordable. There's a epic poster shop, a fun dead stock store (Tombee Des Camions) and too many more to mention. read more