Sorry if there was some confusion. The Square POS system software is free, as compared to buying the software system from QuickBooks ($1200+) or a $69 – $99/month subscription with ShopKeep or Lightspeed. You don’t pay anything for the full Square POS software product and can run it on your smartphone, tablet, or computer at no added costs. If you need to buy an iPad or advanced credit card reader, or if you want an in-store checkout stand with receipt printers, etc., that hardware adds one-time purchase costs. But the base Square POS system software is free, no ongoing subscription costs or purchase fee.
I hope they’re able to set you up with a cost-effective hardware solution. Good luck!