Disclaimer: I'm not getting involved in the ethics of this; just reporting that it works.
When you sign up for a Samsung account, one of the things they ask you for is your DOB. Although this may seem pretty irrelevant, Samsung is kind enough to send you a $25 off coupon on your "birthday". It takes a couple of days for the system to update, so if you are making an account (or xxx accounts) for this, set the birthday for 3 days from the creation date. Your code should arrive at some point on the day of your "birthday". I have successfully tested this on multiple accounts. You do not have to register any devices for a Samsung account. Just go to Samsung, go to sign in, and go to create a new account.