Adding Structured Data (Schema) to Web pages

We are an SEO company. We need a webmaster / programmer with previous experience in adding Structured Data (Schema) Properties. We like to add Structured Data (Schema) Properties to the HTML code of the pages of different websites belonging to our clients The Structured Data (Schema) Properties in every page will be mainly for : Products and Local business. How much is your best price to add Structured Data to 25 pages? This is a repeated work, as we have many websites that need these changes. Include samples of the websites which you already added Structured Data (Schema) Properties to them. .