Some recent social game developer auctions on eBay:

Feelmo Speaking Cards Game Social Emotional Skills Development Kids Learn Gift

$23.97
End Date: Tuesday Jan-30-2018 2:20:42 PST
Buy It Now for only: $23.97
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Hoot Owl Hoot Matching Game Kids Children Simple Strategy and Social Development
$42.41
End Date: Tuesday Jan-16-2018 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...
$16.33
End Date: Friday Feb-2-2018 6:27:00 PST
Buy It Now for only: $16.33
Buy It Now | Add to watch list