First of all, it is extremely difficult to find pricing for these services. I spoke with customer representatives who are not interested in providing information when they realize you are not affiliated with a store and just doing research. My impression is that this field is very competitive and they are concerned about being undercut.
It would be helpful to know exactly what industry you are interested in in order to get more information from these sources. Sometimes it is difficult to even get information on their pricing model. Even 3rd party aggregators do not have useful information - they included notes saying that this information is not common to have.