Replying to Going to Tahoe, what mountains/lifttickets should we buy????

A group of about 8 of us are going to Tahoe in the middle of January. Passes are somewhat expensive and we would like to ski at least 4 of the 6 days we are there. We were wondering, are there any 4 or 5 day passes to different mtns at a discounted rate? I know that when we went to CO, we bought a 5 day pass that inclued Vail, BeaverCreek, Etc. for cheaper than individually buying passes every day.

I've never been there and don't exactly know what the hotel is called, but it is near Heavenly and we would like to hit up Squaw as well(don't know how far they are from one another, but we are willing to rent cars for the week)

Any recommendations on passes/mtns?

Thanks!