POS software pricing models explained Most small business POS providers follow a software-as-a-service model, charging a monthly subscription fee. However, pricing structures and tiers vary.

$149 for Square Stand iPad POS or Square Stand Mount (iPad not included; monthly financing available). $299 for Square Terminal mobile card reader with built-in printer (monthly financing available).

Some robust POS systems can cost hundreds — or even thousands — of dollars, which isn't practical, or even possible, for many small businesses. Free POS systems require no commitment.

While it’s difficult to find a truly free POS system, we had to figure in every price a small business owner might pay, such as hardware costs, one-time fees and processing fees.

We reviewed 15 different POS systems using a complex methodology to help you find the seven retail POS systems for small businesses.