[jo909]

While not priced per GB used, hubic.com is the cheapest storage I know at 50€ per year for 10TB in the biggest package. Uses the Openstack Swift API.

Edit: "unlimited" Services are even cheaper on paper of course, but i don't really trust those.

[nypar]

Hubic by OVH has problems right now see their official message in their Hubic board. ps:never tried c14