You’ve read all of your free items this month. To register, get added benefits and unlimited access to articles, Become a Member. Already a Member? Sign in. Advertising Age Article Abstract Buy an Online Ad in Canada, Get Rest of World for Free Worldwide Sites Yield Bargain Buys but Also Can Frustrate Targeting By Michael Learmonth, Published on June 15, 2009 5 Want more Access, Content & Connections? Upgrade to Membership. We are glad you are enjoying Advertising Age. To get uninterrupted access and additional benefits, become a member today. Register Now Already a member? Log in.