Hi Bazinga,
I’m sorry to hear about your very unfortunate circumstances. I can only imagine what you must be going through.
Hopefully one of the members here will see your post and be in a position to offer some type of help (they would probably message you through the PM system) although many of them probably wouldn’t see it so you may need to call them directly and ask.
It may also be an idea to start a gofundme account so that others that may wish to make a small donation to help your circumstances can help as well. There are many people that have used it successfully that also faced various emergencies.
There are certainly low cost options available other than Chinese memory foam mattresses. Some of the lower budget online options I’m aware of that may be worth considering are listed at the end of post #4 here and the other online lists it links to.
Phoenix