You can do it yourself through various organizations, one of them being Amazon. It just takes several hours of formatting, making the cover, making the back cover, writing descriptions, etc.
I also imagine you need a certain amount of content and do you need to pay for the publishing? I remember someone on the spectrum, Talmer Shockley, said getting his book (The Love-Shy Survival Guide) published cost him his life savings and he sadly disappeared never to be heard from again. I sometimes think about creating enough short stories and seeing if I could get them published in a collection.