Third Ball of Blue

I joined in the third ball of blue yarn on the waistcoat yesterday. It was row 106 of the second side of the body. I'm thinking I'll need one more ball of blue yarn. I expect the second pink ball will run out on this piece too, but it's got a fair bit to go so maybe near the end of the piece. Overall, I think this is going to end up using four balls of blue yarn and three balls of pink. I've still got about 600 rows to go so we'll see how it ends up.