I am doing exactly the same thing. These fools haven't seen the half of their problems...rebuilding will take a long, long time and they are burning their bridges.
Just FYI: when I tried to donate at the Salvation Army, they had 5 secure servers up to donate. I had to try 3 different servers to get through. Then, when I got through, it took at least 2 minutes for the credit card info. to go thru. Was afraid that my computer would time out, and, I am on a cable connection.
But, that is good news, because the response is definitely overwhelming! Just keep trying.
Try local churches, the local archdicese if you want to work through the Catholic church (which is where I am giving) and I'm sure others can recommend other local church groups.