I use womens international pharmacy that compounds transdermal creme meds. I'm on estriol, the creme is $32 for a months supply and the strength doesn't seem to affect the price. I know they make estradiol creme too. I believe this would be much cheaper than patches.

Hormones are relatively cheap compared to anything else involved in transition..Its prob the least expensive.  The patch???  Maybe do some research on this topic.