Against all Jewish tradition, because he wanted to go out the cheapest way possible, my father was cremated and placed in a non-ornamental urn (it looked like a coffee container) in a columbarium where many professors emeriti are interred. The space was only about $100 because of the years he had put in at the university, and IIRC, the fact that he had tenure and emeritus status.
The cremation itself cost $500, 20 years ago. I assume it has gone up, but this was in New York, where it probably is a little more expensive than in other parts of the country. I would expect the cost to be upwards of $500, but not ridiculously so. $500 did not include anything else, like transportation or the cost of the urn.
There are lots of choices for disposing of a cremated body, including keeping it on the mantle.
But since you said something about having relatives’ ashes come down to you, FWIW, some cemeteries do provide small graves for ashes. The funerals I’ve been to for cremated people were put in the ground in biodegradable containers. The graves were very small, and in parts of the cemetery where the terrain was uneven, or something, and not suitable for larger graves, and so, as I understand it, cheap.
I have no idea what you plan as far as disposition of ashes, but I remember from my father that is makes some difference. If they are going to be scattered, they go through some kind of grinding process to make them fine like flour. If they are going to be interred, they are not ground, and so the cost is a little cheaper.
I’m sorry I don’t know how to tell you where to go, or who to talk to. I guess you don’t go to church or synagogue. It still might not be out of line to cold-call a church as ask for advice. I happen to know that the Episcopal Church approves of cremation, because there’s one around here with its own columbarium, so that’s a church you could try. All you’d have to do is ask who they recommend when a parishioner passes away and wanted to be cremated.
I’m so sorry you had to start this thread. I want to wish you “luck,” but that doesn’t seem quite right. I guess I can wish you the minimum of hassle under the circumstances.