OpenCart - how to set up one-off option price, as product quantity increases?

Question

So, here's the problem:

A product costs $10. You then have the option to customize it (with a photo upload to be printed on it) for an additional one-off price of $5, no matter how many products are ordered (e.g. you can order 1 or 5 or 10000 items and the customization price will always be a flat $5).

Currently, when you buy, for example, twenty items and choose the customization option, OpenCart will calculate it: (Product Price + Option Price)*Quantity = (10+5)*20 = $300 . Instead, what I aim to achieve is something like (Product Price*Quantity) + Option Price = 10*20 + 5 = $205

Ideally, I would like certain options to ignore the quantity (so that it will be an additional $5 no matter how many products are ordered), while other option prices should go up with quantity (so that one product customization costs $5, two product customizations cost $10, etc.).

Surely, OpenCart must offer some way to deliver such a fundamental customer experience?

Answer 1

This isn't a standard feature that you will be able to do out of the box. The way I would solve this would be to create a custom Order Total extension and add $5 to the subtotal/total at checkout if any product has that particular option set. This does require some PHP knowledge to do

Answer 2

Instead of rolling your own, you could probably use the Handling Fee extension. You may need to create a new Tax Class for that. But as Jay said, creating your own would be ideal, and yu could certainly use the Handling Fee as a starting point.

Answer 3

Check this out

ADD ONCE OPTION PRICE REGARDLESS QUANTITY

http://www.opencart.com/index.php?route=extension/extension/info&extension_id=13390

Answer 4

My commercial OpenCart extension Setup Fees for Product Options should do what you need. You can see an example here by selecting the rush production option.