Shipping is Big Deal

KT Supply Product Data has indication for the product whether it can be mixed up in one box or not.

No Free Shipping Exist in this world

Someone must pay for shipping cost to carrier no matter what since shipping carrier need to have workers and truck to make a deliver.

Shipping Material and Labor

Before hand it to shipping carrier, we will need to put products in a Box with bubble wrap and someone need to pack it to be safe in transit. All these are Cost

Shipping Strategy

Offer free shipping
In the US, 21% of small and medium-sized online retailers always offer free shipping. Free shipping is never truly “free,” as it means the shipping cost has shifted to you.
Depending on your margins, offering free shipping may or may not make sense, and you may need more information about your customers before you can confidently adopt this approach. Generally speaking, free shipping without conditions is best for high-margin products where you can account for shipping expenses in the overall price of your products.

Many merchants are calculate shipping cost by weight and hide it in sale price to offer free shipping
Pros : Make customer happy.
Cons : Customer need to pay more when they buying a many different items with multiple quantities because each item has hided shipping cost.

Recommend Shipping Strategy

Create a Shipping Model
Less than 1 Lbs : $7.25
More than 1 Lbs : 12.00 base plus 0.50 - 1.00 for additional 1 Lbs. Since KT Supply provide very completive shipping cost