Looking for an app for quantity-based add-ons?

[tk2022]

Hi there,

I am looking for an app that will allow customers to add embroidery to their items at checkout. However, I need to price of embroidery to match the quantity of items.

So if I have 10 items, and want to buy the add on, the price of the add on will automatically multiply by 10

Example: Buying 10 items and wants Embroidery ($2) on all of them, the total added will be $20. 

Thanks in advance