A/C Problem on 99 Prizm

My sister's car went through the same thing and we had to get some freon added to the A/C system ... her car is a 96 with well over 240,000 kms on it. I can't recall the price of that job at the moment .... it was pricey though. My sis called and I asked her .... she said it was $200 (Canadian) because they also had to change the hoses.