According to Winfuture.de, these are the accessories expected to accompany the release of Galaxy Note 9, although they may not make an appearance on phone’s official presentation on August 9th:

– Bluetooth-enabled S Pen stylus in six colour variants: black, blue, brown, gray, violet, and yellow,
– Clear View standing cover case, leather and silicone,
– rugged protective silicone cover featuring a built-in kickstand, U.S. MIL-SDT810G certification.

We do not know the price tags of these accessories.