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I am sorry, but how can DynamoDB be cheaper when I have to pay to provision capacity and SimpleDB is practically free for low-volume stuff like this? S3 is probably an even better option, which seem to be on the roadmap, thankfully.

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DynamoDB is quite inexpensive at low usage levels. The Free Tier gives you: "25 GB of Storage, 25 Units of Read Capacity and 25 Units of Write Capacity – Enough to handle up to 200M requests per month"

DynamoDB's free tier doesn't expire after 12 months. (Source: http://aws.amazon.com/free/)

Both DynamoDB and SimpleDB have free tiers. credstash can happily live in the free tier until you are using it A LOT (more than 25 fetches/second, sustained). Storage in SimpleDB costs about as much per GB as DDB, but DDB gives you more free storage, so DDB is cheaper for any amount of data over 1 GB.

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