A PPC agency can charge for the initial setup and for the monthly management of your PPC ad campaigns. This cost typically ranges from 10-30% of the overall ad spend or can include a flat rate for the setup cost and a management budget every month. For example, if your monthly ad spend budget is $5000, you can expect to spend at minimum $500 in a monthly management fee to a PPC agency plus the setup cost. To determine the cost of a PPC agency to manage your ad campaigns, you would first need to determine what your overall ad spend budget will be per month and consult with a PPC agency to find your monthly cost.