IUI Medications

I was hoping I could get some feedback about the best places to purchase the medications my doctor is putting me on for my IUI treatments. I will be paying out of packet and through my own research so far I haven't been able to find a good answer. The prescriptions my doctor is writing for are the following: Letrozole 5mg, Ovidrel trigger shot, and progesterone 100mg vaginal suppositories. Thanks!