poppin, I think you'll be hard pressed to find a large print Dostoevsky unless you live in a fairly large city, but if you are okay with reading books online---its been a long time since ive looked to see if they are still here, but litnet used to have a large collection of full text books. I just took a quick peek to see if I could remember the pathway (I couldn't) but maybe with a little more looking you could find the book here.
there is this:
https://openlibrary.org/search?q=cri...ode=everything
and this:
https://www.gutenberg.org/ebooks/2554
if you are little bit web savvy, there is also file sharing.
and my goodness even this:
https://www.youtube.com/watch?v=dPGlFXNrlYs&t=27s