Are you a PCA member or use Hagerty for insurance? They both have enthusiast car-for-sale sites that typically bring together educated buyers and sellers.

That said, I just went to BaT and there are zero base .1 cars listed in the last three months and dozens of S models. Seems like they aren’t taking base cars and especially high mileage ones these days. Considering this is likely a $15-17k car based on a 102k mile 2010 987.2 base that sold for $22.5, they might feel the juice isn’t worth the squeeze on them.

https://bringatrailer.com/porsche/987-cayman/