Websites to buy used bikes in France
I am new to France and would like to explore Paris on bike. I would be here for few months so was looking to buy a cheap used bike. However, I am finding it extremely difficult to find a decent websites where these kind of ads are listed. We have something like gumtree.com in UK where people can list items they want to sell. Is there something like that in France or specifically for Paris where I can search for bikes? Your help would be appreciated.