The cost of outsourcing varies widely depending on the scope of the outsourced services. For instance, the cost of email marketing alone can range from $500 to $2,000 per month. Companies typically spend anywhere from $1,000 to $20,000 per month to outsource marketing services. Once you’ve determined the scope of your marketing needs, ask potential partners to provide you with a quote for their services before you decide which agency to go with.