What events are those codes from? anyone can post a screenshot?

You can use it for amazon vps. Yes, you need a valid credit card to sign up an amazon aws account.

I have three AWS Credit vouchers. Each voucher is with face value of $200.00. The expiration date is 12/31/2015. The sale price is $100 per voucher paid in BTC. Escrow can be used.

The covered services are:
AWS CloudHSM
AWS Data Pipeline
AWS Data Transfer
AWS Direct Connect
AWS Elastic Beanstalk
AWS OpsWorks
AWS Storage Gateway
AWS Support (Basic)
Amazon AppStream
Amazon CloudFront
Amazon CloudSearch
Amazon DynamoDB
Amazon ElastiCache
Amazon Elastic Compute Cloud
Amazon Elastic MapReduce
Amazon Elastic Transcoder
Amazon Fulfillment Web Service
Amazon Glacier
Amazon Kinesis
Amazon RDS Service
Amazon Redshift
Amazon Route 53
Amazon Simple Email Service
Amazon Simple Notification Service
Amazon Simple Queue Service
Amazon Simple Storage Service
Amazon Simple Workflow Service
Amazon SimpleDB
Amazon Virtual Private Cloud
Amazon WorkSpaces

While I am waiting, can you share some spare ones if any?

Thanks for sharing.