Some recent design social games auctions on eBay:

Social Game Design: Monetization Methods and Mechanics-ExLibrary

$6.99
End Date: Saturday May-6-2017 13:28:28 PDT
Buy It Now for only: $6.99
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Mobile & Social Game Design: Monetization Methods and Mechanics by Tim Fields Pa
$68.80
End Date: Tuesday May-16-2017 17:18:03 PDT
Buy It Now for only: $68.80
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Mobile and Social Game Design : Monetization Methods and Mechanics, Second...
$40.09
End Date: Sunday Apr-30-2017 10:43:29 PDT
Buy It Now for only: $40.09
Buy It Now | Add to watch list