I paid around £700 for my last pair of varifocals (I also have astigmatism and a big difference between my eye strengths)
It seemed like a lot but I wear them every day and they tend not to need adjusting more than every two years, so cost per wear? Negligible.
It’s the quality of the lenses, getting them extra thin or they would look like the bottom of lemonade bottles, non reflective scratch proof etc etc. which makes them so expensive, I rarely pay more than £150 for the frames, but again, if I am wearing them every day - and I do - they have to be right,
I believe I get what I pay for.