I started with an article by Marge Cox titled 10 tips for Budgeting from Library Media Connection, January 2008, Volume 26, Issue 4, pages 24-25. This article abstract listed several good tips for justifying budget expenses for libraries.

Then I used the Subject term : School library finance from the article listing as my first pearl. This led to a group of articles that were more closely related to my search criteria. However, there were also 145 results.
As the next pearl I used the subject term: library finance from an article within the 145 results and received 12 results. After adding this last pearl the results were less on school and more on libraries in general. I feel that the first results from the last pearl gave the most relevant results.

I found that the important part of this type of search was having a relevant article at the start of the search. I also found through trial and error and this type of search does not work well if your database does not support the journal from whence the article was originally published.