Some recent social game developer auctions on eBay:

1993 Press Photo Social Commission Development basketball team before a game

$24.88
End Date: Thursday Feb-15-2018 16:15:01 PST
Buy It Now for only: $24.88
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Feelmo "Speaking Cards" - Social Emotional Skills Development - Counseling Thera
$28.74
End Date: Tuesday Jan-23-2018 6:33:09 PST
Buy It Now for only: $28.74
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Game Plan for Social Media Lead Generation : How to Develop a Business Strate...
$20.88
End Date: Saturday Feb-3-2018 18:00:38 PST
Buy It Now for only: $20.88
Buy It Now | Add to watch list