There is no fee to apply. However, depending on the research guide and where the research guide is published, a fee may be required to offset the publishing costs of the research guide. Fees are variable and depend on the publication. We charge fees simply because we are independent of the respective publications in which our research guides appear, and we need to charge fees to maintain that research independence. As a result, we independently purchase the page in the publication on which our research guide appears, and we ask research guide participants to help offset those publishing costs.