Ask HN: Offline SaaS (Web App)

We are developing a POS for small/medium sized stores in India as an web application for very minimum price. However the problem we face is, many of the small shops cannot afford to setup internet connection. We would need to now setup it in localhost. The problem is entire code resides on the localhost machine, is there any approach by which we can tackle this. Or it is better to advice them to go online.