Some recent social game developer auctions on eBay:

Flash Game Development: In a Social, Mobile and ..., Gladstien, Keith 1435460200

$22.10
End Date: Tuesday May-9-2017 21:19:17 PDT
Buy It Now for only: $22.10
Buy It Now | Add to watch list

Hoot Owl Hoot Cooperative Board Game Matching Kids Toy Social Development Skills
$19.87
End Date: Friday May-5-2017 22:50:47 PDT
Buy It Now for only: $19.87
Buy It Now | Add to watch list

Game Plan for Social Media Lead Generation: How to Develop a Business Strategy
$18.04
End Date: Thursday May-4-2017 17:05:46 PDT
Buy It Now for only: $18.04
Buy It Now | Add to watch list