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! Nature Cluster are quality products from PLANET that you can rely on. At PetBird Xpress we only offer branded products from premium manufacturers. 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.