Maybe you can contact the manufacturer directly and get it at a more affordable price. I am sorry that your dad is going through this. Cancer is just terrible. I have seen it draw out for a long time or take some unsuspecting young person in a blink of an eye.
I hope you can take some time with him. Help him do what he needs to. Blessings and hugs.
kat
Me-53(and learning!) S24, S21, D18, D17 Just keep swimming, Just keep swimming. Dory