MusicNotes: MusicNotes is an online music store that offers a vast collection of sheet music, including arrangements for popular songs. Check their website to see if they have the sheet music for "Mary's Boy Child - Oh My Lord" by Boney M.
Sheet Music Plus: Sheet Music Plus is another online retailer that sells sheet music and music-related products. You can search their catalog for the sheet music you're looking for.
Hal Leonard: Hal Leonard is a major publisher and distributor of music, and they publish a variety of sheet music collections. You might find the sheet music for "Mary's Boy Child - Oh My Lord" by Boney M on their website or in music stores that carry Hal Leonard publications.
Music出版社: Music出版社 is another music publishing company that offers a wide range of sheet music. Check their website or contact them to see if they have the sheet music you need.
If you're unable to find the sheet music through online sources, you might also want to check local music stores in your area. Some stores may have a selection of sheet music or be able to order it for you.
Remember that the availability of sheet music may vary depending on factors like the popularity of the song and the publishing rights. If you're having difficulty finding the sheet music, you might consider contacting the publisher directly to inquire about it.