It's originally from:
http://www.walmart.com/ip/Mainstays-3-Piece-Office-Set-Black/24705186
I got it from Walmart last year, it's in like new condition as shown in follows:
$15 for each pieces and $40 for all of them.

Sorry that you need pick them up yourself. Currently they are in my apartment which is close to downtown Sunnyvale. Email me to get the specific address if you like the deal.