Tracking is just checking the toe-in. There are also caster and camber adjustments that are required to fully align the wheel.
Tracking normally costs about £10. A full wheel alignment using laser measuring equipment can cost £50-100.
Inside wear is normally caused by incorrect camber and therefore just getting the tracking checked will probably not fix the problem.
If you have wear on the inside and outside then your tyre pressures are too low.
This explains things:
http://www.familycar.com/alignment.htm
The IS200 has a little negative camber, which improves handling, so a small amount of wear on the inside is expected.