Try using the Business Source Complete database as your starting point. By doing the following search I was able to find some information on the Saudi Arabian budget.
line 1: saudi arabia (subject)
line 2: oil (select a field)
line 3: money or earning* or fund*
When you locate articles that are on-target, you can use the subject terms included in the citation record to try other searches.
For more information, you can make an appointment with a librarian.