In response to your comments, I think the idea of setting up a way for people to contribute via Paypal is great, as long as we donate the money to charity if (when?) we get it back at the end of all this. My intention was to provide something people might want in return for their money, I don't really feel comfortable asking for it straight out. If you want to contribute and you've already got a book, a button will be set up at some point so you can donate whatever you want. We'll be "paying it forward" to Shelter when we get things sorted.
Again, thank you all, I'm a little overwhelmed, to be honest.