IT wants a butload for their games. it only stands to reason that even used prices are ridiculous.
highly depends on the version year and cabinet condition. an entry level nighthawk golden tee (2008 or 2009) will be in the 1000 to 1200 range. some of the newer years will be in the 1800 to 2200 range.
for us, a brand new 2015 cabinet from IT is about 5000. tack on another 500 for shipping (just to canada) to get it. by the time you factor the exchange rate on us to ca bucaroos, you are looking at 7200.
if you are looking at older cabinets under 2006, it's going to be the custom "red board" "green board" systems. most of those can be had for 800 and under depending on condition.