There are different factors that contribute to the cost of booking an ad in Mirror. The cost differs in terms of ad format you choose, the category of your choice and the number of editions you choose to publish.
Classified text ads are charged per line whereas the display ads are charged on the basis of per square metre.
Again the cost varies depending on the selection of page for a display ad. The advertising cost for Front Page, BackPage or Page3 is much more compared to other pages.
To know more about the cost click on the link here.