Time Out says
Take a Saturday stroll through this friendly market.
Held on Petersplatz every Saturday, Basel’s popular fleamarket is a great place to rummage for a few choice finds at a bargain price, including vintage handbags, old manual cameras, silverware and china plates, secondhand clothes and children’s toys. Prices are reasonable and the friendly stallholders are happy to answer questions and barter over a sale. You may even find yourself haggling with a schoolboy, as local children are allowed to sell their toys in the middle of the square.