Where can I obtain tables of P-V-T/compression factor data?
One place to look for simple fluids is http://webbook.nist.gov/chemistry/fluid/.  But there are only a limited number of compounds treated.

Be warned that the data in the NIST Webbook is smoothed.  Collecting data of this sort is very difficult.  Many different sets of observations are combined and fitted to an appropriate equation.  What is at the URL given above is computed from that equation.

If you are looking for overall compression factors, this will do very nicely.  If you want five figure precision in compression factors, well, this won't do.

Another place to check is the  which is a primary source of raw data.