Oh the joys! From my very first experience of what this area of my body could do - it was HELL. Later I learned there were some nice things that could happen in this area...
My costs (Australia):
Contraceptive Pill: ~$80/3months (control of hormones and contraception, this may be dropped later; if so, switch to condoms, which is price of sex minus babies, not cost of being of the female gender)
Direct-period-costs: I use pads, works out at ~$15/month, thinking of trying some reusable soft cottony ones... only ones I've found to date are from the US. I don't spend anything on pain relief, but I used to use Ponstan, Neurofen, Panadol... whatever I thought was working. Pain decreased as age increased.
Preventive medical (Pelvic and Pap): Got my first one a couple of months ago, slightly later than I should have at 24yo, and got sent to a Physiotherapist. Not sure about cost, but prior to my rebate it was $320.
Misc. medical issues: I guess the physio counts here. Nothing yet due to health insurance, but should be around $50/month, I think, for the next 6 months...
Hair removal: I like mine. I shave my legs about once a week... but I like how they feel. I'd guess $5 per month.
I like my toilet paper papery and recycled. Working on eliminating paper from the kitchen, though.