eCommerce - Item Limit Calulator

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I've got a very specific need which is outlined here:http://www.concrete5.org/marketplace/addons/ecommerce/discussion/cu...

In a nutshell, I need the code to check and make certain that 5 and only 5 total items are selected before the order will process.

Apparently, this is a time-consuming thing to do. Any ideas on what could be done to help with this?

viriesque