Some recent social game developer auctions on eBay:

Hoot Owl Hoot Matching Game Kids Children Simple Strategy and Social Development

$42.41
End Date: Thursday Feb-15-2018 17:24:11 PST
Buy It Now for only: $42.41
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Early Intervention Games: Fun, Joyful Ways to Develop Social and Motor Skills in
$5.10
End Date: Saturday Feb-17-2018 9:40:09 PST
Buy It Now for only: $5.10
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Startopia PC CD outer space station alien races creature social development game
$12.13
End Date: Sunday Jan-21-2018 15:43:56 PST
Buy It Now for only: $12.13
Buy It Now | Add to watch list