The best way to get cheap TGV tickets is to book your train journey as early as you can. Great deals can be had if you book weeks or months in advance. Tickets to ride the TGV Lyria are available up to six months in advance, for example.
The French railway company SNCF has a large catalog of discount cards and seasonal offers. Signing up for a discount card may seem expensive at first, but if you plan to travel by train throughout France and parts of Western Europe, it can pay for itself and save you big.
TGV Lyria offers discounted tickets to groups of five ($47.60 / 45 € per person) and groups of 10 (up to 75 percent off).