Google's "See What's In Store" (SWIS) feature requires product prices. 

If you are unable to upload a spreadsheet with your product prices, you can install an upgraded Pointy box that connects to your receipt printer. This box will automatically update your product prices as you print receipts.  

This second Pointy device will be used in addition to the device that is already connected to your barcode scanner. There will be a one-time charge of $199 for the device.   

More resources

How do I upload a spreadsheet?
What is "See What's In Store (SWIS)?

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