Once you’ve selected an appropriate SD card, Amazon gives you a lot of control over how to use it with a Fire tablet.

The marketplace is beginning to take shape for mobile card readers with the June 29 disclosure that VeriFone Systems Inc. plans to introduce a card-reading accessory for tablet computers this year.

While Android might beat iOS in credit card reader support, there are still plenty of options available for iPhone users who want to accept credit card payments on the go.

Essential hardware: Tablet POS, card reader, cash drawer, receipt printer Estimated cost: $200 – $1,500 Additional costs: Sturdy tablet stand, extra receipt paper rolls Retail store (single ...