Marsha if estradot 25s are available in your area, ask your drs if they will change your prescription to request 2x 25 patches and wear to 25s at once.
My surgery has done this in the past, and I wear all sorts of different patches to make up the dose I am on (125) . The daily dose released on 2 x 25 patches is the same as one 50 patch.
Worth asking until supplies are back properly.