Good deal: 20% off iPhone 5S at Virgin Mobile USA

http://www.virginmobileusa.com/shop/cell-phones/iphone5s-gray-phone/features/

$439 for 16GB

$519 for 32GB

$599 for 64GB

Especially good if you live in a Sprint LTE area.

iPhone 5C is also 20% off ($359 for 16GB)