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! You won't find any Private Label knock-offs at PetBird Xpress . Just branded items from manufacturers like PLANET. 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.