Newegg offers the PayPal Here Mobile Credit Card Reader, model no. 4027, for a $3 profit with free shipping via the directions below. That's the lowest total price we could find by a buck, although we saw it for a $5 profit in June. (Most stores accept the rebate but do not include an additional coupon for profit.) It's compatible with iPhone, iPad, and most Android devices. This reader accepts most forms of payment via a 3.5mm jack connection. Coupon expires September 1. To get this deal:

1. View the PayPal Here Mobile Credit Card Reader for $14.99
2. apply coupon code "826BTSMBE167" to cut it to $11.99
3. enter the alpha-numeric code on the card reader box for a $15 rebate, yielding a net profit of $3.01