I am turning my bathroom into a spa space...advice?

I’m turning our bathroom into an ultra girly spa space! Drop your favorite products and ideas. Under $10 a plus since I’m supplying it for all 3 of my girls. They are super into skin care/makeup. Nails, hair, skin, makeup, skin care. Anything in between! Brushes, towels, anything. Amazon is my fav! Also Ulta! Even dollar tree has some finds! I think this could end up a really fun post!

I like to buy travel size things when I wanna try something to see if I like it. If u have a bargain goods store near try there too.