Some recent design social games auctions on eBay:

TEEN MAGAZINE The Board Game RARE!! Complete!! Design A Mag Cover Social Girls

$39.99 (0 Bids)
End Date: Sunday Mar-5-2017 13:23:11 PST
Bid now | Add to watch list

Mobile & Social Game Design: Monetization Methods and Mechanics by Tim Fields Pa
$68.80
End Date: Friday Mar-17-2017 17:18:03 PDT
Buy It Now for only: $68.80
Buy It Now | Add to watch list

Social Game Design : Monetization Methods and Mechanics by Brandon Cotton,...
$24.95
End Date: Sunday Mar-12-2017 15:03:21 PDT
Buy It Now for only: $24.95
Buy It Now | Add to watch list