CowBoom has Pre-owned iPhone 4/4S, iPad, iPod, and Mac on sale.
New customers can use the following coupon codes to save more:
$5 off $50: coupon code DealAM5
$6 off $60: coupon code DealAM6
$10 off $150: coupon code DealAM10
$20 off $300: coupon code DealAM20
All the codes above do not apply to deal of the day and auction items.