The cost is not there for some of my material on the iTunes Store

If you're seeing the word Purchased in the store rather than the price or a Play button then this is an item you've hidden from your purchase history. See Hide and unhide music, movies, TV shows, audiobooks, and books - Apple Support to unhide.

tt2

Chico,

If you are an artist who is selling your content in the iTunes Store, you can contact Apple via the direct line for artist support:

https://artists.apple.com/support