Too bad you bought the wrong skin, but you can get one in 2 days if you want.
This is how i do it.
I basically ignore everything and go straight to the boss, in zone 2 use the shortcut worm and it transport you directly to the second boss. The third zone takes a little more time because king toad can be a pain if he keeps stomping and not opening his mouth.
It takes me +/- 12min to run (for 1 character ofc.)
So it means you get 2 Bauble bubbles when you kill 1 boss, there are 3 bosses and you can do it on 5 characters so you will get 30 Bauble bubbles a day.
Hope this was helpfull. I apoligize for my english it isn’t that good
Note: don’t use that easy mode thing, whatever it’s called. If you activate that you won’t get bauble bubbles from the bosses.