Sorry . . . forgot. If you haven't already discovered it, go to the Home Page on this site (Click on the blue and red France.com above) and on the right side of your screen are a list of button links, Hostels, Airfares, Rail Travel, Car Rentals, etc. Click on both Airfares and Rail Travel to check times and prices for your Paris to Montpellier travel. You can also check car rental prices if you plan to rent a car in Montpellier. (If you are staying more than 17 days, don't rent. You can lease for less and I can give you web info for this.)
There are also hotel links for cities other than Paris on this site, so check them too.
There are also hotel links for cities other than Paris on this site, so check them too.