PetBird Xpress offers over 1,000 items including Diet Conversion Kit. Our Customer Care Representatives are standing by to help with your questions. We do stock Diet Conversion Kit and they usually ship within 1 day. We work very hard to honor our shipping and delivery estimates! 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.