I am so very sorry it came to this
I know what is like being a single parent being how I am one. So even $30.00 is a lot of maney (utility bill for 1 month, etc.) But given his condition, you really have to ask yourself if you want to put yourself in theposition for continued drama and emotional hell. There is no gaurantee how long his episode will last and to what extent he will perform viscious acts to hurt you.
Please remember, this is not your ex-partner, but the illness that is making him do it. His choosing not to seek treatment for something that is causing such obvious adverse affects in his life is more than dissapointing to you I'm sure. The illness makes them feel as if all their actions ar completely justified and totally sane. We see it from the outside in a logical manner, but they don't have that luzury at the time they are experiencing a mania/episode.
I am going to assume that whatever possessions your son has at your ex's place is replaceable right? E-bay is a source to tap for replacement purposes. Another is your local Craigslist.com.
You are in a really painful, heart wrenching position right now and I must say that my thoughts go out to you. I do not wish the same for myself or anyone else I know. As cliche as it is, TIME does help to heal and move on.
Of and on, I think about whether I will be in the same boat as you...with my own partner. It may happen, but I am hoping and praying it doesn't. Life is not predictable, that's is for sure!
I hope this response helped you. Please know we are all here for you, not matter what :)