"US Standard" means "us-east-1".
According to S3 Pricing FAQ
There is no Data Transfer charge for data transferred between Amazon
EC2 and Amazon S3 within the same Region or for data transferred
between the Amazon EC2 Northern Virginia Region and the Amazon S3 US
Standard Region.
This will mean that if your instance is in any of the us-east-1 AZs and your bucket is in the US Standard region, any movement of data between the 2 should cost nothing.
Also, depending on your use case, you may want to look at the new AWS SDK for JavaScript in the Browser as it may offer the direct to S3 uploads you're looking for.
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