You are correct that if you choose to retake the PCAT, you will pay another $150 for it. The application process isnt cheap. When you sign up on PharmCAS, the processing fee alone is $150 and for each school you apply to, tack on $50. Youll also be paying supplemental application fees for the majority of these schools, which can range from $40 to over $100, depending on the school. If you apply OOS and get an interview, theres the traveling expenses. Most schools require a deposit to hold your seat in the class (which will be applied towards tuition), and this can also range in price. I just received my acceptance a few weeks ago, and it was $1000 for my spot.
Whichever healthcare field you choose to go into, whether it be pharmacy, medicine, dentistry, PA, etc, the application process costs money. My friends that took the MCAT paid around $235 just for the exam. For each of these careers, the application services (AMCAS, CASPA, AADAS) charges a fee, along with additional fees for each school applied to and fees for all those supplemental applications.
Its a good thing you started researching this while youre still in high school! I know people that have just started applying in the past year and were shocked at how much it costs. Going into the healthcare field isnt particularly cheap, so be certain that this is what you want to do before you spend lots of money on the application process.