Special shipping option for single product

I have a client who wants to be able to single out certain items to calculate the shipping cost via USPS.

The rest, he uses UPS.

Can anyone tell me how I would be able to do that?

What happens when both UPS and USPS products are in the same order? :unsure:

I'm having this problem as well. I have one single accessory product that weighs much less than a pound and would prefer to just add a flat rate for shipping and handling and hand-deliver it to USPS each day. Shipping the product USPS is on average $1.70. I use UPS for my other products, and want to keep it that way. But, through UPS ground, the low weight product is calculating at $11.47 for shipping. The product shipping is more expensive than the product. Many of my customers need this accessory and need to have access to order it online, but will not pay for this product due to the UPS shipping fee.

Help!!

See if this would help to customize the shipping UPS module:

// add extra charge for products_id 27 for $1.70 per quantity
        $usps_extra_charge = $_SESSION['cart']->get_quantity(27) * 1.70;
        
        $methods[] = array('id' => $type,
                           'title' => $this->types[$type],
                           'cost' => ($cost + MODULE_SHIPPING_UPS_HANDLING) * $shipping_num_boxes + $usps_extra_charge);