Go Fund Me is a good bet for piling up donations pretty quick. My sister got breast cancer a couple of years ago and couldn't work. Her friends started a Go Fund Me campaign, emailed everybody they knew. She got a few thousand in a few weeks and ended up with $15,000 after a couple of months. Go Fund Me takes a small percentage and you keep the rest.
You (or a close friend) sets it up for you. Emails go out to all your friends and relatives, everybody that your husband served with, all of your childrens' friends so they can get their parents to donate.