Dragon home price with deleting /bubbling Is there a way to figure out the cost drop if I delete dragon homes? I have 32x lvl 1 (30 bubbled), 2x lvl 2, 2x lvl 5, and 1x lvl 7. 

I'm trying to decide which would be most cost effective in the long run without compromising much with sleep time. My goal is to get to 1 lvl 8, which with my numbers now I would need about 408 more lvl 1 homes, and my current cost for a lvl 1 home is 1805. I know it would drop the cost of dragon homes to delete the lvl 7, but without knowing how much it will drop the cost (or how much for the lvl 5s and 2s), I can't do the math to figure out which ones I should delete.