JournalPrices is an academic journal database that was built by Professor Preston McAfee, Distinguished Scientist at Google, and Ted Bergstrom, Distinguished Professor of Economics at UCSB. It studies the relationship between the subscription cost of individual journals and number of citations to the journal, number of articles in the journal and so on, and classifies each journal as good or bad deals.
The dataset contains detailed information (discipline, price per article, price per citation, etc) about around 11,000 journals, and the story behind how the data is collected can be found here. You can access the Jornal Prices tool is now available at Mcafee.cc website where you can search and sort journals based on pricing or other factors. It is widely used by scholars and university libraries now.
For more backgrounds about academic journals, please refer to the below resources: