These prices make the new Standard-IA storage significantly cheaper than the Reduced Redundancy Storage, even if you end up reading the data back.

However, I find it interesting that in addition to the cost per GB to retrieve data, this new storage class also has a significantly higher per-request cost, too. Actually, it looks cheaper to upload an object as a different storage class and then transition it to Standard-IA, since PUT of IA costs $0.01 per 1000, but PUT of another class costs $0.005 per 1000, and the cost to transition another class to IA is $0.01 per 10000. It's a small difference ($0.04 per 10k objects), but if you store an obscene amount of data on S3, that seems like enough difference to matter.