I wonder if they have considered setting up a paypal account to receive donations, there are also a few other "Crowd funding" internet services that could be considered.
I'm not an expert on them, I've just heard about them.
Most modellers can spare $5 these days...that's usually the cost of a small vial of paint, if there was a way for them to easily donate $5 through a crowd funding internet app, it's possible the response may be surprising.