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 Amazon to Make It Easier to Buy Its Ads With Self-Serve Tool VivaKi Is First Agency to Use Tool, No Timetable for Broader Rollout By Tim Peterson and Kate Kaye, Published on July 23, 2014 0 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. Become a Member Already a member? Log in.