I think I can get you a better deal.

Buy $1000 target gift card from Plastic Jungle for $935.
2.5% cash back from Topcashback - $23.375
Sell $1000 target gift card to cardpool for $880.
4% cash from topcashback - $40

($935)
$880
$23.375
$40
$8.375

Let me know if there is an issue in the calculation