The first thing you have to do is be absolutely vigilant. What this means is you must begin searching internet databases on a consistent and thorough level. Scholarships.com, Fastweb.com, 123finjobs.com, monster.com, dreamjobs.com, and many others are great resources for searching. The key point of success with this method is to search all of them for all available keywords. Begin making a list of all available internships in the locations you want, what they require, what they take to apply, and any other information you are going to need. Begin applying for them one by one, giving as much time to each as you can. This method bases its success in the absolute number that you end up applying to. For example, if you apply to fifty internships the possibility that you are going to be denied for all of them is very slim. Also check Craig's List because you are usually going to find more specific internship opportunities here. Remember to look for scams or internships that disguise themselves as part of your industry.