I haven't researched the full contract award or pulled a copy of the original RFP, however, work on the Census FactFinder website was part of an $89.5mm contract awarded to IBM Federal in 2007 (for, potentially, 9 years) [1]. I wonder if the $33mm quoted in the FOIA request response is the total cost incurred to-date on that award (including services performed for the entire Statement of Work) rather than the actual cost of ONLY building/updating FactFinder.

I wouldn't be surprised if the $33mm price is correct ... but not 100% sure it is without spending more time looking around and, potentially, seeking further information through FOIA.

[1] http://www-03.ibm.com/press/us/en/pressrelease/22467.wss