Shipping cost depends on the store, who sets their own shipping rate. Shipping is charged per product, as many products come from different stores and their shipping cost may vary depending on weight and packaging needs. The destination for the order may also affect the shipping cost.
If you are on the mobile app, you can see the product's estimated shipping rate when you scroll down on the product page.
If you are on the website, you can add the product to your cart and view its estimated shipping rate from your cart.