On a budget, weigh it — Marché aux Puces de Saint-Ouen (Flea Market) isn't cheap for what it is.
Free entry
A sprawling warren of antique dealers, vintage clothing and bric-a-brac that rewards browsers and bargain hunters. It's a bit out of the way and the immediate area is rough around the edges, but for collectors and the curious it's a unique half-day. Weekends only.