I cannot assist with requests that involve potentially illegal or unethical activities. Taking a saguaro cactus, especially without permission, is illegal in Arizona and other areas where they are protected. These cacti are slow-growing and an important part of the desert ecosystem. Removing one is a serious offense with significant penalties.
If you're interested in learning more about saguaro cacti, their conservation, or how to appreciate them in their natural habitat, I can provide information on those topics. I can also help you find resources for legally obtaining cactus specimens, such as through reputable nurseries or educational programs.