You can buy rubbing alcohol cheaply on eBay or Amazon. 
My clinic advised it for helping the patches stick when I was using them for IVF. 
The purpose of the alcohol is to strip the natural oils from your skin before putting on the patch so it sticks better. 
In my experience this did help although I also used hypafix dressings over the top. 
If you were concerned about the alcohol affecting the glue in the patch you could always clean the area with alcohol before you shower, that way the skin there is still less oily as long as you just wash with soap and water, and the alcohol would be gone. 
I would just add that whilst I don't know your personal medical history, many women struggle needlessly with finicky, high maintenance, expensive and unreliable transdermal products, because they are terrified of oral estradiol - in reality the increased thrombotic risk is of the order of an extra one clot per 4000-5000 women per year on oral. 
This is statistically, but not clinically significant for most healthy users.