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Almost all companies will offer marketing/advertising apprenticeships or internships. The key is to get to the decision maker. I would contact the human resource manager after checking the companies' websites. Explain that you would like to intern and learn as part of your education and that you are willing to do so without any charge. Another source might be your business instructors. Most of them have friends in business looking for help without having to pay for the same.
Let me know if this helps.