PetBird Xpress stocks 1,000's of items including Nature Cluster. Quality Customer Care is our first priority - try calling us at 800-448-2014. We do stock Nature Cluster and they usually ship within 1 day. We work very hard to honor our shipping and delivery estimates! PetBird Xpress is proud to represent PLANET. We never sell unproven off-brand products. At PetBird Xpress, your satisfaction is our number 1 concern! We've been at it for over 15 years and we have satified thousands of customers like you.