For new customers only, take $10 off your first superfood smoothie meal delivery order when you enter the coupon code GBSAVE10 at checkout at GreenBlender. Plus shipping is free. This drops the price of a 10-serving smoothie box from $49.90 to $39.90 after the code or $3.99 per serving. Each box includes ingredients to make five different smoothie recipes that make two 12-ounce servings. Boxes are delivered on Thursdays and the menu for future weeks is available online. Note: This is a subscription service, but you can skip weeks or cancel at any time. There is no sales tax.