Counter shop, one register
A Reader M2 paired to an iPad. Cheapest way in. Takes tap, chip, and swipe.
Busy counter or you want it standalone
An S700 — a full screen-and-reader in one. No tablet needed.
Farmers markets, deliveries, mobile
An S710 or the M2 with a phone. Both run on cellular or wifi.
Buying
The Hardware page runs a short wizard and links you directly to buy the recommended reader. Your choices are saved, so you can leave and come back.
What you don't need
No cash drawer, no receipt printer, no computer required. You can add them later if you want them.