dj Mcrae, ask the school as to why. There may be a legit reason. You are not necessarily being ripped off, but only paying higher rates than others available.
Depending on what the differance in rates are and how close you are to completing your GFPT, I would not recommend changing schools right now. If you do, the new school will want to check you out in their a/c, do a few training area exercises and a few hours CCTs before they continue with the syllabus training (not right, but they will). In the end it will cost you more then paying the dual rates.
Once you have completed your GFPT, then you could look at another training organisation unless you are happy/work a deal, with where you are.....