That's actually a pretty solid price on a Gen 2 HPWC based on what I'm seeing these days. Supply v demand on this discontinued item has the prices climbing as of late and they won't be going down since Tesla isn't making anymore.
Before someone shows up to say "But but Gen 3 $550 new..." they're not the same. You're comparing apples to aardvarks.
Gen 2 does stuff Gen 3 doesn't. For some owners that means Gen 2 > Gen 3. If you don't know what those differences are then you likely aren't in the category of owners that would benefit from a Gen 2.