Musicnotes.com: A large collection of sheet music, including arrangements for piano, guitar, and other instruments.
Sheet Music Plus: Another comprehensive resource for sheet music, with a variety of formats available.
Alfred Music Publishing: Publisher of Okami video game soundtracks and arrangements.
Hal Leonard: Another major publisher of sheet music, including arrangements for video game themes.
You can also find Okami sheet music through independent sellers on platforms like Etsy and eBay. Additionally, bazı video game soundtracks and arrangements may be available through streaming services like Spotify and Apple Music.