Create an account.
Go to Lists/Registries.
Create a wedding/baby/college registry (all 3, just do it).
Make sure the due date/wedding/college start date is over 31 days away.
Add anything you want to your registries.
Wait 30 days or so then check your registries then check completion coupons
and you will see multiple coupons for 15% off anything in your registries.
Once the coupons have arrived you can add new items to your various registries.
These stack with Cartwheel and Red Card.
The Gmail dot trick works here.