Also from OVH, have a look at OVH Object Storage, which is pretty much S3 but for 1/10 of the price [1].

There is also a GitHub comparison for all object storage providers (this price reduction isn't included yet as I see) [2].

[1] https://www.ovh.com/us/cloud/storage/object-storage.xml [2] http://gaul.org/object-store-comparison/