Have you gotten 2% via Ebates to work for Target when buying GCs? It says they exclude gift cards... Exclusions: Cash Back is not available on Baby care (diapers, wipes, formula), all gift cards,
Just load the Target app on your smartphone. Then in the menu, there's a gift card option where you can manage and combine your little gift cards into one big one. Once you have them combined, you can shop on Target.com. When you check out, if your default payment is set to be your Red Card, it will give you the 5% off. At that point you can apply any gift cards you like before paying whatever is left over on the Red Card.