Who much the albums cost?

It depends on the artist and how new the album is. If it is older it will cost less. But new albums usually cost $18 - $20

It depends on the artist.

I think we paid for one less than $20 dollars

If I remember right, i spend around $30 for an album. There are others that are cheaper or more expensive as well. For a specific price on a certain your best bet is to call the store.