What options exist for under 150 Euro to travel from Brussels, Belgium to Tignes, France?

I wanted to go for skiing from July 10, 2013 to July 15, 2013 at Tignes, France. I live in Leuven, Belgium but boarding a carrier from Brussels is also fine. I have search for numerous options bus connections, trains etc. but they are all expensive. Moreover all this hassle has left me confused with which option to choose. I also searched for car pooling options but it looks like there are none to Tignes. Any help appreciated!

EDIT:

I searched carpooling but nothing was available from Brussels. The closest point available to Tignes by carpooling was Chambery(I may be wrong here), but again nothing from Brussels. Next I from all places in France to Chambery (so that I can reach there from Brussels using some other way, kind of via route) but nothing sensible appeared in search.

I searched for trains here, but the return journey tickets are beyond EUR 250. And after that I have to go from station to Tignes, that is not included.

I made some similar searches on Eurolines website too, but all in vain.

I searched for flights here between Chambery and Brussels(no result) and Geneva and Brussels(got few flights) but this option is again reaching beyond EUR 200(after including transfer from airport to Tignes).

I would be looking at something something below EUR 150. Travel dates are set and I'm not at liberty to change them. If it matters, I'm also not a resident in EU.