It depends.
I think the best approach would be to have one of us contact the snowcat outfit directly and work out a deal for one day, 3/30/07.
Say that deal costs X. I think what the website says is X will be $200 per person, provided there's 10 in a group.
If X+99 is more than the "package deal" specified, then go for the package deal.
The only "package" I know about is organized by Heli-trax out of T-ride. It costs $1895 per person, double occupancy for 4 days, T-ride, helitrax, SM, SanJuanSnowcats.
http://www.helitrax.net/packages_sanjuans.html .
Is there some other deal?