Try out these pilot search filters for Health Services Research (HSR) from the National Information Center on Health Services Research (NICHSR). The two available filters are on Quality-Related Queries and Cost-Related Queries. They act in a similar way to the clinical filters, only they are more focused on either costs/economics or appropriateness/outcomes assessment/process assessment. The URL for these filters is: http://www.nlm.nih.gov/nichsr/hedges/search.html.
They might prove to be an efficient way to search those pesky cost/economics questions.