Be non-whiny about it, show your parents you have a plan for where to put the gerbils, you have specific money set aside to pay for it (please don't try to use your college savings), explain you already have the cage - which isn't being used, etc.
If your parents say no at first, don't bug them about it! Calmly ask them why they object, and respond in an adult like manor and once you have an answer of why not - leave them alone for a week or two while you show them how well you can take care of your current GPs and revisit the subject at a time when both your parents are in a good mood
Again - Good luck!
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