UPDATE! Please check out version 2 of this torrent here: https://finewhiningandbreathing.wordpress.com/2014/08/28/ping-pong-the-animation-ost-v2-bundle/
The Ping Pong box set comes with an EXTRA ost, so here it is:
320 kbps MP3 Torrent: http://www.nyaa.se/?page=view&tid=593410
320 kbps MP3 DDL, with metadata tags*: http://www.mediafire.com/download/l34qr4j86ogk2cg/Ping+Pong+Extended+OST.7z
*Contributed by a kind user on /a/