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. Nature Cluster orders are processed within 1 day. We ship from three warehouses via Fedex and UPS. PetBird Xpress is your source for quality branded products from PLANET. We don't stock any inferior house brands. 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.