Staples offers the PayPal Here Mobile Credit Card Reader, model no. 4027, for $14.99. This $14.99 rebate cuts it to $0. (Enter the code from your reader packaging and the value will be refunded to your PayPal account.) With free shipping, that's among the best deals we've seen for this reader, although we saw it with a $3 profit after rebate three days ago (since expired). It's compatible with the iPhone, iPad, and most Android devices. This reader supports most forms of payment and features a 3.5mm jack connection.

Looking to make a profit? Add three to your cart and apply coupon code "25147" to cut the price to $34.97. Redeem the $14.99 rebate three times in order to bag a $10 profit.