Most of Copernicus’ 52 journals have not changed in price since 2016, and many indicate that the current price has been in place for several years.
4 journals have either clarified pricing, introduced an APC, or increased in price since 2016:
Annales Geophysicae increased their per-page price from 45 to 60 EUR in January 2017 (33% increase)
Archives of Animal Breeding waived fees in 2016 but now charges 55 EUR per page.
Earth System Dynamics: price information was not found in 2016, as of today indicates a cost of 50 EUR per page as of July 2017.
Wind Energy Science waived fees in 2016 but now charges 69 EUR per page, since Nov. 2, 2016.
7 Copernicus journals indicate that the cost is “currently waived”, hence presumably plan to introduce page charges in future: Advances in Statistical Climatology, Meteorology and Oceanography, Earth System Science Data, Geographica Helvetica (subsidized by Swiss Academy of Science), Journal of Sensors and Sensor Systems, SOIL, and Web Ecology.
Only 1 Copernicus journal, Scientific Drilling, is “free of charge”, sponsored by International Continental Scientific Drilling Program.