Some recent social game developer auctions on eBay:

Flash Game Development: In a Social, Mobile and 3D World

$8.44
End Date: Thursday May-24-2018 16:13:36 PDT
Buy It Now for only: $8.44
Buy It Now | Add to watch list

Startopia PC CD outer space station alien races creature social development game
$12.13
End Date: Monday May-21-2018 16:43:56 PDT
Buy It Now for only: $12.13
Buy It Now | Add to watch list

Early Intervention Games: Fun, Joyful Ways to Develop Social and Motor Skills in
$11.28
End Date: Friday May-4-2018 14:14:09 PDT
Buy It Now for only: $11.28
Buy It Now | Add to watch list