I don't think you're going to get cheaper than Glacier. You could probably colo an atom server with 2x 6TB drives fairly cheaply somewhere but then you'd have

I don't think you're going to get cheaper than Glacier. You could probably colo an atom server with 2x 6TB drives fairly cheaply somewhere but then you'd have to amortize the $8000~ cost of the server over how long you plan to keep it running.