price for Eurostar Ski Train to the Alps

Travelling to a ski resort is never quick, whether you go by plane, train or car. And surprisingly perhaps, if you are taking a train down to the Tarentaise region of the Alps, it takes about the same time as flying - sometimes quicker.  You are going to spend around 8-9 hours getting there, however you go (and that is without flight delays)

But how does the cost of travelling independently the Alps by train compare with flying?