Have your students practice the skill of percent of change (along with sales tax calculation) with this motivating project that incorporates current music, movies and games. This could also be used for assessment. I usually give a small prize to the student that comes the closest to the requirements to add extra incentive for the students.
*This is an editable document that can be adjusted in the future (the values can stay the same but the titles of popular music, etc. can be modified).