In this case I understand not downsizing until your kids are established with a job/place to live.
Depending on equity and their mortgage payment it may not even be possible to downsize without paying more per month. That’s the insanity of the current market.
Remember this is an occupied family home with an unoccupied room. Not a whole property.
What would you suggest?
I would fully accept a law that allowed companies to advertise nationally the pre-tax price with a small disclaimer saying applicable taxes vary by location, and then require the in store price tags to reflect all taxes.
There’s no excuse not to anymore. Yes it does vary, and a computer can easily adjust the price.