It may be to late to arrange it but you can also donate your body to science/med school.
You can also have a much cheaper funeral than the funeral home will try to sell you. You don't need all the frills. One way to save money is to not go to the cemetery. just have the service then you don't need an escort, limo, etc. You can also ask to be shown the least expensive caskets available they won't show you these unless you directly ask. Ask for an itemized breakdown and only select the things you really have to have. There are lots of extras added that can be done without.
I just wanted to add that I do know people who donated their family members bodies because they could not afford the price of a funeral.
OP, I am so sorry that you are having to go through this.

I am so sorry for your loss.