I'm blind, and all the assistive technology made for us is so expensive it's ridiculous.
Cost of a printer for the sighted, which needs ink to run: Maybe $60 or up to $200, depending on quality.
Printer/Embosser for printing Braille, which may use thicker paper but does not need ink, only instructions to use a particular Braille code, and the machinery to poke holes in said paper: Fucking $8000.
The free! screen-reader I use is called NVDA, and was made by blind people in Australia as a direct response to the price of the then most-promoted/recommended Screen-reader, Jaws. Even now, Jaws has problems NVDA doesn't, for all that there are some things it can access that NVDA can't. Even so, it's price is utterly insane. It costs $1700. You can fucking buy the professional version of an operating system for less than half that! You could buy an entire computer and get NVDA for it and have money left-over!
Braille Displays, the things you can connect to your computer so that it will display the text on screen as Braille, line by line I might add, and also type in Braille, start at a couple grand in most cases. Freedom Scientific, the same people who made Jaws incidentally, charges over $4000 for a Braille Display that shows one line at a time. What does it charge for one that does the exact same thing but with two lines of displayable Braille? Fucking $12000. For something that's essentially an external keyboard that has machinery inside it and pins that move up and down to display Braille! I'd understand it being somewhat expensive, like maybe $1000, that I could cope with. But the price of an entire computer packed to the nines with decent hardware? Times three for the two-line one? That is what pisses me off.
On the other side of the coin, there's a keyboard of the musical kind that I have on my long-term wishlist. It costs $1100 for the 61-key model with sensitivity to how hard you press the keys. If you want more libraries of sounds than what it comes with, you have to buy those separately. It has accessibility features built into it, and has basically from conception. But sighted people use it too. And there is so much you can do with it that I consider the price worth paying. I can't get into all of it here, but trust me, it's worth every single cent you pay for it.
I will also add that people have made cheaper Braille displays than the ones mentioned above, and cheaper Braille-Writing machines that are like type-writers for Braille paper. I can't speak to the quality of those products, though, as I have neither tried them, nor known anyone else who has tried them, though I've heard anecdotes of dissatisfaction with some of the lower-end ones. I'm not sitting here saying cheap =good and expensive =bad. I'm saying that given the materials used, a piece of software should not be more expensive than the operating system it's run on, let alone anywhere from double to eight times the price! That a Braille Display should cost maybe the same as a decent computer monitor and an external keyboard, because that's what we're getting it for! That I shouldn't have to pay thousands of dollars for the capability to print in our own written language!
And of course I agree with OP that wheelchairs are insanely overpriced! If a nice bicycle costs a couple hundred, and an electric scooter costs about $1000, then the prices of the equivalent wheelchairs should match those, not the price of a fucking used car! And we should all be angry about that!