The phrase "additional cost" refers to an extra amount of money that needs to be paid in addition to what was originally expected or planned. Full definition
In addition costs vary between brokerages and its worth finding out which brokerage is the most competitive when it comes to spread and commission structure. (thefxview.com)
At first, big content additions cost no in - game money, and new cars were relatively cheap. (kotaku.com)
There was in addition the cost of bailing out banks such as Northern Rock, RBS and HBOS. (theconversation.com)