Right, PRISM is just the project that gives the NSA access to data stored on other (Google, Facebook et al.) servers. The active eavesdropping and other systems aren't included.
The data storage, processing, and development costs for the bulk of the programs that intercept/store the raw data are likely not included, either.
Based on the new slides[1] from WaPo, PRISM collection spans many other non-PRISM programs, such as the now-known MAINWAY (internet metadata), MARINA (internet content), and NUCLEON (voice content).
