The best cash register for a convienance store in my experience is one of the SAM4s SPS-500 series models. The 520R and the 530R are both designed for high volume retail locations like a C-Store, smoke shop, liquor store and more.
With the optional memory the SAM4s SPS-520R is capable of 60,000 UPC items, which is more then enough for most stores. To round out the system you can add a Datacap device to interface your cash register directly with credit card payments.
Both of these cash registers have lots of options available like
- Cash Register computer interface
- Scale interface
- DVR interface
- Bar code scanner
- Graphic rear display
- Gift card interface
- and more