Hi there,
I've been using "
Whistler Star Express" for the past few years and they have been great! You can book either private or shared transportation with them and their chauffeurs are great -- they even help you with luggage and stuff like that. You should check their website out, it has all the pricings and info

My first year, I booked shared transportation and the second year, I booked private transportation. I prefer private transp. more as I get the whole vehicle for myself & my group.
Hope I helped you a bit!!
-Ryan