My funeral costs

I was diagnosed with stage 4 TNBC while switching jobs. I'll leave my son and husband with no life insurance. One of my concerns is them not have the stress of the funeral costs on top of everything else thrown their way at my passing. 

Given the progression of the cancer I think I have about 3 months left. I would also like to give my son some small security as he completes his last few years of high school and get's ready to to go off the college.