To buy train tickets from Germany to France, compare the booking links we list. Prices are usually the same, but sometimes vary slightly.
Depending on where you start in Germany (and where you want to travel to in France), you can either use the route via Cologne by Thalys to Paris. Or from Frankfurt or Stuttgart via Strasbourg/Saarbrücken to Paris by TGV/ICE. There is also a direct train from Frankfurt in direction of Marseille.
If you want to use a night train, have a look at the Russian night train Moscow to Paris (enter in Berlin). A very nice experience and high quality.
The Europe Special price of Deutsche Bahn is available from EUR 39. As earlier you book, as cheaper the prices are.