Kittie S. Henderson & Stephen Bosch have published "Seeking the New Normal: Periodicals Price Survey 2010" in Library Journal.
Here's an excerpt:
A number of publishers upped prices for 2010. Springer announced a five percent increase. Elsevier price increases are also in the five percent range, with the notable exception of The Lancet. The 2010 price for The Lancet jumped nine percent over 2009 levels; that increase was still smaller than in previous years. In October, the library world reeled as Nature Publishing Group (NPG) announced a 640 percent price increase (from $39.95 in 2009 to $299 in 2010) for a print subscription to Scientific American. The cost for the digital site license also rose substantially, and a number of consortia, like the Committee on Institutional Cooperation (CIC) and the Oberlin Group, refused to renew. The announcement came only weeks after NPG bought the magazine.