If you have a harbor freight nearby you can get 2 pairs of 3 ton jack stands and a floor jack, and lift the car and put it on the stands. Walmart also sells jack stands and jack stands as well as most auto parts stores. I guess you could also round up 3 spare tire/wheel combos and put those on.
To jack the car there are several good threads here, and also this article:
Jacking Up and Lifting the Porsche Boxster on Jack Stands - 986 / 987 (1997-08) - Pelican Parts Technical Article