I live just south of Paris. Took a hiatus from BJJ but I joined a wrestling club. My primary club has wrestling, sambo and a circuit training class twice a week for 180€ a year. However, when joining the club you also join the French Wrestling Federation which allows you to train at any club in the country for no additional charge. I bounce around the city (mainly three clubs) to train as much as I want. It's easy to go 7 days a week if you feel like it (and don't mind commuting a bit). You can also do grappling in this way.
BJJ in Paris is laughably cheap compared to the states if you're willing to sign a one year contract.