"Why are these three so rare?"
"Jade Dome, as its name suggests, needs to grow in cold ice mountains. However, the climate of the Southern Border is humid, and even in winter, there are no ice mountains. But, it's said there is a unique place, that particular Jade Mountain exclusive to the region. Due to its great height and perennial snow, commoners simply can't reach it. The 'Jade' in Jade Dome signifies its preciousness, and it doesn't grow every year; sometimes you may not see it even once in ten years. Such heavenly treasures usually have guards around them, and without preparation, you can't just pick them."
