Hi loopy, my thought are with you and your family, a lovely gesture your making. As a suggestion, this is what I did for my daughter, some years ago, she's Autistic with some other problems, and we wanted to reise money to take her on a therapy course.
We collected Alluminium cans, but to do this, we put posters with her photo and description in newspaper shop windows, and put an ad in the free papers,
as a result, (and we didn't realise this would happen), some people sent us cheques, on terrific young man knocked on the door and said he was running the Marathon, and he'd like to do it for her. Because of the generosity of these people, we raised more than enough, so we donated the surplus money to her day centre.
Maybe you could try something similar.
Good Luck, and best wishes.