Hi Bobidi- I've only had Evorel 25, 50, 37.5, Estraderm 75. Estradot 50. Estradot 75 and Elleste Solo MX 80. These are all twice weekly ones. Once weekly changes (Femseven, Progynova) ar less popular I think.
I can't remember the Evorel but the area in cm2 is given in the spc for each product easily available by googling. I think I posted it once ie the relative szies of some of them.. Evorel aren't available at the moment. Estraderm are mahoosive and don't stick well. Elleste are medium and stick brilliantly. Estradot are teeny tiny and also stick pretty well but due to the nature of the adhesive go a bit gooey in really hot weather eg if sunbathing/sitting outside in hot sun although I wasn't at all bothered by that in the 12.5 years I was using them (and I love my sun).
Yes supply will depend where you live. Get the pharmacist to put just the dosage of patch (only - rather than brand) on your prescription and they will give you what's available or else depending whether your pharmacy is in house like mine is or you take your prescrption to any pharmacy - find out which they can get and ask the doc to write a prescription for that one.
I renew mine online and I just put a note saying please don't give me Estraderm or a once weekly patch and the pharmacist ( at the local GP practice) usually rings me and says what's what at the time.
Good luck
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Hurdity x