I'd recommend going through your university. You want loans that are Sallie Mae financed and highly preferably subsidized (no interest while in school). Private loans are way, way worse in regards to interest rate and almost certainly unsubsidized or even require you to start repaying while in school.
The actual interest rate system keeps changing and it's likely that all of your loans will have their own rates but Sallie Mae does keep track of this stuff for you. You won't really be able to shop around in this regard (assuming you go through your school). All you can typically choose is the institution brokering the transaction.