How to make an online store without prices?

Question

CMS

Hello! I recently received an assignment from a customer to implement an Internet car service. But I can not choose how and on what to implement!

The functionality is as follows:
There are goods in the form of spare parts for cars. Items have no prices. But when adding to the cart and checkout, an order is created, which gets into the customer's admin panel, which details the customer chose. Here we are not talking about a purchase, but simply about choosing "Typical favorites", but so that the customer sees the final order.

Faced the following problems:
1. In any plug-in of an online store, you need to specify prices for goods.
2. Difficult to create 4 levels category selection.
-Car brand
--Model
---Modification
----Year

How can I implement it and on what cms?
The layout has already been done. Everything is ready.

Answer 1

in wokomerc there is the possibility of paying ala cash on delivery.
I made such an online store on the Woodmart theme where there is no payment and applications simply fly to the post office.

Answer 2

You can build a directory on joomla and custom fields. There is a filter for it, a simple basket. Do not need prices - do not do it, there is full scope for imagination