I have always used Walgreens Specialty Pharmacy, but have heard good things about Freedom Fertility Pharmacy, too. You might need more Gonal F depending on how you respond. When you get all this stuff, they will send you all the syringes and little alcohol cleansing wipes, too. You might want to invest in some band-aids and a nice heating pad, though. I always get cutesy, fun band-aids...somehow it makes the process less daunting.
Freedom Fertility has a great website, and these are the prices listed for the drugs you mentioned:
Leuprolide 2 wk kit - $129
Menopur 75iu vial 10 vials - $729
trigger - $67
progesterone in ethyl oleate - $45.90 each
The Freedom website also has videos of people doing injections so you can watch them to remind yourself or to bolster your courage
The Progesterone in ethyl oleate is the progesterone injection that you'll start the day of your retrieval. It is intramuscular (i.e. in the buttocks), and you'll probably do one every single day until you are 12 weeks pregnant. Not fun, but worth it. My rear was so sore I could barely move, but the heating pad helped a LOT.
So excited that you are getting started on your IVF journey...feel free to ask questions any time!