ThinkPad P15 Workstation Gen 2

You are missing some crucial details, and your friend probably isn't aware that lesser hardware can run his CAD or 3D modeling software. P15 likely refers to Lenovo's Thinkpad Line of laptops, specifically the P series. These laptops are workstations and are NOT cheap. Modern P series Thinkpads can

A p15 runs about $4k+. A lenovo zbook refurb runs about $1200. If you see less, be wary. That's the cheapest thing for CAD that meets those specs. If by cheap you mean something less than that, there are none. At least not new, refurbished in good condition or really vaguely cheap. These are mobile