The basic expenses are access point /electronic shelf label /PDA.
The cost of access point depends on the size of your supermarket.Most supermarkets only need one or two access point which will cost USD375.7 or USD751.
The cost of electronic shelf label depends on the number of SKU and the size of label.You can calculate it by your self.
Usually we only need one PDA device, but if your supermarket is huge and there are many employees, you can also purchase more PDA.
Other costs including software(USD300) and some holders which is very cheap.