That is cool and all, but for sure this is a situation where one should strive to have this be 0% App and 100% built into Shopify, using nothing more than Liquid and Javascript. Now that it is established that unit prices are supported in at least a few countries too, that is for certain something that could be rolled out to everyone. As usual, the trickiest part of the equation remains tiered pricing where the more you buy, the cheaper it gets, or, for some industries anyway, the dimensions affect price in ways that are not so easy to pull off. It remains true though, that even in those cases one can easily capture dimensions, and alter pricing, and ultimately get orders flowing, without using external App code.