I'm fairly certain that you cannot transfer or sell AWS credit
1.3. Promotional Credit you receive is personal to you. You may not sell, license, rent, or otherwise transfer Promotional Credit. Promotional Credit may be applied only to your AWS account, and may not be applied to any other account. AWS Promotional Credit has no intrinsic value, is not redeemable for cash, has no cash value, and serves merely as a means to recognize and provide an incentive to use our Services. Promotional Credit may not be purchased for cash and AWS does not sell Promotional Credit. Promotional Credit is nonrefundable.