I keep hearing this panic about it being outlawed. That FDA thing is wanting to outlaw compounds like bio-identical hormone creams that make unfounded health claims. I expect estriol or something similar to be showing up for MS after the Phase III clinical trials (that's in about 4 years tho).
Any compounding pharmacy can order estriol by the gram and compound it into 8 mg capsules.
I'm afraid I have no clue whatsoever about the birth control thing. Sorry.
My insurance pays 1/2 of the cost of $120 for 90 capsules. That'd be $40/month out of pocket, not too steep.
It is recommended that you take a progesterone in conjunction with estriol. Unopposed estrogens stimulate uterine and breast tissue growth (not in a good way

). My prescription for 3 months worth of Provera cost $3.50 after insurance, but I think the total amount was about $10.