I am only aware of the cost of private places. In the area where I currently live it's about $5000 to $8000 per month, depending on the place. I believe this is about average in much of the US, with the bigger cities being higher, even double that! It appears to me that many people pay for this with a combination of long-term care insurance and retirement income of all sorts.

In my experience once someone needs memory care they need someone there 24/7, preferably professional caregivers. I do not know how people, family and friends, do this without that. Depending on the patients condition it maybe easier or much more difficult. One caregiver at a facility who was from a developing country told me that in their country they don't have memory care or assisted living facilities. Everyone in the village helps out to take care of those who need it. That's obviously very different in the US.

I am not sure about this but I think in cases where people cannot afford a private memory care facility many people go into public places that are subsidized by the government. I also do not know just how different the quality of care is in those places versus the private ones.