Honestly, housing anywhere in the American West. In Boise, the median house price has gone up 54% since 2015. 84% of the city is zoned for single family homes.
The problem with the American west is that people from California (and the other wealthy coastal areas to a lesser extent) see it as within the range of places they'd consider moving too.
There's no universe in which an rapid infusion of people who have more money than the locals is not bad for every local not selling overpriced garbage to the newcomers for a fat margin.
You see the same problems on the east coast and in the southeast but you see them in more constrained geographical areas because people from NYC don't cash out move to Indiana or Mississippi, they move to Vermont or Pennsylvania.