Hi Roger,
Are you interested in only 'in-person' classes? If that is the case, then you should be able to find options in major cities, but even those options will be limited. Beyond those types of classes, there are also online classes and Self-Study options that you might find quite helpful.
Since you've put in some study time already, I'd like to know a bit more about the work that you've done and your timeline/goals:
1) How long have you studied?
2) What materials have you used?
3) Have you taken any practice CATs yet? If you have, then how did you score (including the Quant and Verbal Scaled Scores)?
4) When are you planning to apply to Business School?
5) What is your score goal?
GMAT assassins aren't born, they're made,
Rich