REVIEWS:Bought one valid AWS code and got a bonus for a glitch in selly.gg.
I was given a vouch copy by OP and I can say that the credit does indeed work.
Applicable products
Below are a list of services that can be used with this specific credit.
AWS Config
AWS Data Pipeline
AWS Data Transfer
AWS Elastic Beanstalk
AWS IoT
AWS Key Management Service
AWS Lambda
AWS OpsWorks
AWS Storage Gateway
AWS Support (Basic)
Amazon AppStream
Amazon CloudFront
Amazon CloudSearch
Amazon DynamoDB
Amazon ElastiCache
Amazon Elastic Compute Cloud
Amazon Elastic File System
Amazon Elastic MapReduce
Amazon Elastic Transcoder
Amazon Glacier
Amazon Kinesis
Amazon Machine Learning
Amazon RDS Service
Amazon Redshift
Amazon Route 53
Amazon Simple EDI
Amazon Simple Email Service
Amazon Simple Notification Service
Amazon Simple Queue Service
Amazon Simple Storage Service
Amazon SimpleDB
Amazon Virtual Private Cloud

bought all remaining 3 codes, all work.

Rico
I have just purchased one, please stock them up and keep em coming.
Just bought the last 2 codes and they work great!
The expiration day is very far away which is perfect!
Keep them coming pls

) I need 2 more to stack fully.
Brought one code (only stock) and worked perfectly!
I just purchased one. Transaction all went smoothly. Thanks Azzazel!
I can confirm it is code "EDU_ENG_FY2017_Q1_2_GH_150USD". valid until 2019-02-28 for me.
Just bought a code, everything was smooth.
PS. Selly behaved a little weird though... I sent the money, but it RETURNED me the payment, and then took it back again. Weird. Anyways, many thanks to the seller.
Bought the $150 coupon. Works like a charm. Thanks!