Some of the prices can seem quite steep but I think that is the case with most things these days. Many dentists do offer finance options so this may be of help to you, but even then I think fixed braces would your best bet as they are most likely to be the cheapest. Treatment like Invisalign is therefore a no no.
Checking out some dental schools is a good idea. Depending on what your tooth abnormality is you could also consider treatment like Veneers or Lumineers as an alternative. Just a thought.
Hope that helps.