Based on this product's specifications, here are some alternatives and similar models
AC Adapter Dell 65W 19.5V 3.34A for XPS 18 — power adapter
Summary description:
AC adapter for Dell XPS 18 providing 65W output at 19.5V and 3.34A. Designed to replace or spare the original power supply for charging and powering the XPS 18. Suitable for home, office, and travel use where the specified voltage and amperage match the device requirements. Helps ensure stable power delivery and device operation.