Are you looking for the extension which lets you add the absolute price on custom options? Install Magento Custom Options Absolute Price extension and avail such functionality on your Magento store. When you add price on product custom option, Magento adds that price to the product's base-price. This entry will show you how to add an extra price type which allows custom options to override the base price. Custom Options Absolute Price will work with next input types: text field, text area, drop-down, multiple select and radio buttons. Absolute price extension does not depends on item quantity. The Absolute Price will be added in the final price at checkout only once and independent of quantity in cart.