Ask HN: Cloud storage without monthly fee per GB?

I'm looking into the costs for an upcoming startup that requires cloud hosting.

The problem is that each user will need to upload a set amount of 1.6GB of data per month (no more, no less). Calculating on Amazon S3 pricing after 4 years, it will have cost $237 to host only 80GB of data per user.

The data is continually aggregating so the monthly pricing model per GB is not a good idea.

Does anyone know of a reliable cloud host provider with API that charges per GB (but not per GB per month)?