Following the book, at the Diabetes Hands Foundation we have put out a number of press releases about our work since we started our work last year. To do so, we have spent $80 per press release using PRWeb (a friend of mine who is head of PR at a midsize company and had budget for more than that said she hadn't gotten any more out of PRWeb paying more money).
Source: NetSquared, a project of TechSoup.org blogs