IIRC, my Ugly Fish polaroid prescriptions, via an optometrist, were $540 delivered. If you wanted off-the-shelf Ugly Fish polaroids, with just a magnifying section at the bottom, non prescrip, they were about $150, I think? I have certainly paid $900 for prescription glasses--if you go multi-focal, with transitioning ( auto-darkening) with good frames, easy to spend that much. I have had the whole hog--all that, auto darken, polarised, and I don't believe they were as good as these ones I have now. And it really hurt seeing them tinkling away towards the bottom , attended by a big bullshark, when a mackerel ripped line across the side of my head as I went for a close-in gaff shot
I have only just gone back to Bi-focals after using multi-focals for many years. I firsr started using reading presciptions turn of the century, and eventually had to go multi-focals for work. I only really needed reading glasses still, but I was in mining construction at the time, and you just can't be putting on/taking off reading glasses under mandatory eye protection all the time when you needed to read fine print out in the field. So I just gave in and got multi-focal safety glasses, and started using multi-focal for every day use as well. Mine is probably a pretty common story.
In my case, my middle distance and long distance eyesight has been improving, particularly since I had a bad Pterygium removed mid last year. While this may seem a cause for rejoicing, the optometrist says it can be a sign of bad things to come.
So, for now, I'm back to bi-focals. If you get presciption, you get to choose just how mch of the field of vision is affected, and adjusted as to what your average reading distance requirements are. You don't get this with simple magnifying-type (non-prescrip) correction.