I broke down and bought myself much needed new shoes, which were of course much more expensive now than they were two years ago when I bought the last pair. But the new shoes are so much better for my ankles and stability now that I'm no longer having to fight myself from rocking backward and tilting to match the massively worn-out parts of the soles. My ankles will thank me. (They better thank me.)
For reference:
Old shoes
New shoes