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Maybe you should take another look at pricing? DynamoDB is like $0.002/GB/month more expensive than S3 for storage. Requests are more expensive, but you're also not reinventing every wheel and if they're as infrequent a set of requests as this seems designed for it's still only a few bucks a month.

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My infrequent reads and writes are huge, and possibly spikey.

> Write Throughput: $0.0065 per hour for every 10 units of Write Capacity (enough capacity to do up to 36,000 writes per hour)*

> A unit of Write Capacity enables you to perform one write per second for items of up to 1KB in size

As I understand it, for $4.68/month I can only add 36 MB/hour, and thats assuming my objects are in exact multiple of 1KB.

Ahh, gotcha. That makes sense, this setup makes a lot more sense if you're dealing with very spikey reads.

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