Thank you for all those who contributed to this list.
Discounted gift cards make a huge difference in your bottom line when it comes to reselling or just plain old purchases. It can be the difference between a good deal and a great deal.
If you can add another layer of using American Express Gift Cards to pay, you can add an extra 2% of savings compared to your regular credit card if you buy them when Top Cashback is paying 2.25% (after activation fees). It will often make a difference in which site actually has the best discount.
It's also nice to know if your gift card will come immediately so you can purchase a discounted gift card right before making a purchase.