Ah, I’ve figured it out. Using the store locator tool, it looks like many Dollar Tree stores in your state have converted into Dollar Tree Plus. Dollar Tree Plus does not stick to the original Dollar Tree mantra of everything being $1.
Places without “Plus” in the store locator tool are regular Dollar Tree locations where everything is $1.25 or less.
In my region, I cannot seem to find any Dollar Tree Plus locations, thank goodness. Everything is still $1.25 here.