Some recent design social games auctions on eBay:

Social Game Design: Monetization Methods and Mecha

$6.94
End Date: Tuesday Jun-13-2017 11:50:00 PDT
Buy It Now for only: $6.94
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Mobile & Social Game Design: Monetization Methods and Mechanics by Tim Fields Pa
$68.80
End Date: Thursday Jun-15-2017 17:18:03 PDT
Buy It Now for only: $68.80
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Social Game Design: Monetization Methods and Mechanics-ExLibrary
$6.99
End Date: Monday Jun-5-2017 13:28:28 PDT
Buy It Now for only: $6.99
Buy It Now | Add to watch list