There are a number of places that you can look for a telemarketing service when you need one. Sometimes they advertise their services in the classified section of the newspaper or in the larger advertisement section. They might also be found in the telephone directory or various magazines. One of the best places to look for these services especially when you are looking specifically for sales lead generation skills is the internet. There is a good variety of these agencies that you can contact online quickly and easily. You can compare them to each other better as well as they have all of the information on their website.