We did the Renault buy-buyback thing once a couple years ago and it was great. You have to take it for at least 17 days I think. It was cheaper than renting. Something about the tax laws in France allows you to buy a brand new car for 18 days or whatever, then Renault buys it back at the agreed price and somehow makes money selling it as a tax-free used car. Or something. I never did understand it. You just pay the agreed difference. Insurance is included.
The price is cheapest if you pick up and drop off in France. We got a Renault Espace minivan for family of 5 (3 teenagers) with luggage. It was a diesel with a stick shift. The kids ended calling the Espace the Es-crappy, but I liked it.