I need some advice

So in my previous post I said I have endometriosis, so according to my doctor if I want to get pregnant I would need to do it soon. I had surgery about a week ago to get most of it removed so I have some time before it spreeds again. My boyfriend has hpv and doesn't want to risk giving it to the baby and won't even consider trying. He said I can go with a donor if I wanted, does anyone know how much that usually cost and how it works.