Great Question! Because there is no such thing as free shipping. When shipping is "free" — shipping costs are built into the pricing structure of the products. We could not offer affordable individual spice refills if we also had to include shipping fees for each item. Instead, we charge discounted shipping costs, once on your full order.
To keep prices affordable on spice refills (most are $3-$5), we calculate shipping by weight for orders under $150. This way, whether you order one item or ten, you pay for the shipping fees once. Base shipping starts at $3.95.
Additionally, we ship plastic-free, which has added material costs. We balance what's best for the environment, is financially sustainable for us and cost-effective for you, to arrive at what we think are reasonable shipping fees!