Given your interest in an adult pet alligator and considering you have no prior experience with caring for exotic reptiles, it's crucial to select a product or service that not only provides a healthy and suitable alligator but also offers support and guidance for beginners. Since you are prepared to provide water features like a pond or pool, but did not mention other necessary amenities such as a large enclosure, heat lamps, or specialized diet, it's important to choose products that either bundle these features or include support in setting them up. Sadly, purchasing live adult alligators online or on platforms like Amazon is typically not possible due to strict regulations and the complex care requirements of these animals. In light of this, we suggest focusing on educational resources, professional services, and reputable breeders who can guide you through the process of acquiring and caring for your new pet.