does it matter?

I will be doing my first iui this month. If that doesn't work, I'll be moving onto ivf. Here in Melbourne, there a three organisations to use. Monash, Melbourne and primary. I know that Monash is expensive. Melbourne ivf is bulk billed and only costs about $2000. But then I have been told to go to primary ivf because it only costs about $800. My confusion lays here. I'm inclined to go the cheaper option, but am concerned that there is less of a success rate. Any advice or feedback would be appreciated.