I'd like to buy train ticket from Lyon Part Dieu to Embrun (a sky resort near Italian border).
At https://en.oui.sncf, I searched for itineraries, after clicking on "using only TER" option, and it showed a train itinerary leaving 15:20. But when I searched for reserving & buying tickets, it only shows itineraries that includes a segment of TGV ride between Lyon and Valence. The TGV ride only save me 12 minutes and they charge 75 euro for the TGV segment separately.
I am guessing it would be far cheaper if I also take TER for this segment because they just combine the TER segments together and calculate the price according to the combined distance. Am I right? If so, how can I buy a ticket, or at least know how much it costs?