As a quick FYI, I see in the comments below people comparing s3 pricing to the likes of a VPS instance storage from XYZ hosting company.
Given that you have no redundancy with that storage you could save an addition 30% and use reduced redundancy storage in s3 which still provides redundancy to a second AZ (just not all of them or across regions in the odd case of US Standard)
Given that you have no redundancy with that storage you could save an addition 30% and use reduced redundancy storage in s3 which still provides redundancy to a second AZ (just not all of them or across regions in the odd case of US Standard)