Use this coupon code at checkout: MSNZKSCA
Right now you can get the Red Lava Rocks for Plants for $13.99 on Amazon. Use coupon code: MSNZKSCA to get an additional $5.60 off to make it $8.39. Shipping is free with Amazon Prime for orders over $25.
Amazon.com price frequently change and can happen at any time. Please refer to post date to see when deal was posted.