You could always look around at technical schools in your area. We have a few here in the PNW one in particular Ashmead College
http://www.ashmead.edu/ that offers a
personal training degree/classes.
If you don't mind doing the study at home/at your own pace you can always pick a cert and study on your own. Do you know what your focus will be?
I got certified through NASM (National Academy of
Sports Medicine) and they are pretty big on corrective exercise.
ASCM is also very well known and I hear it is pretty clinical. Also, there is NSCA which is pretty well respected but is more strength and conditioning focused. Did your gym tell you which certs they except? Some gyms are very particular, others don't care what you have as long as you are certified so they can insure you. good luck!