A hair mask once a week can turn wash day into a treat, so compare hair mask prices before you stock up on the one your hair loves. Rich masks, rinse-out conditioners, leave-in creams, hair oils and ampoules each suit dry ends, curls or dyed hair in their own way. Whether a product is rinsed out or left in matters as much as the jar or tube size, so match both before you look at the offers.