Indeed 
I went Googling and a few folks have have actually filled out the quote request that Disney offers on it’s site for licensing.
It can depend on a few things, but one was basically 130K US Dollars and it also stated you had to be a well established business for approx. 5 years. And even that won’t guarantee you will receive permission. They need to inspect said merch and approve to ensure proper branding. For instance .. Ariel better not have blonde hair and a green clam bra 