We charge a shipping fee for each glass aquarium ordered based on the size of the item as follows:Pico: $20 (free shipping for orders over $150)Nano: $25 (free shipping for orders over $250)Small: $30 (free shipping for orders over $350)Midsize: $50 (free shipping for orders over $500)Large: $300 (free shipping for orders over $2500)Additional aquariums cannot be used to reach the minimum order threshold for free shipping. All glass items that we ship are packaged carefully and insured.