I purchased from; http://en.haokang.cn/product.php#pingpangqiu.
I paid $12 per square meter. They are approved by ITTF and their flooring was used in Beijing Olympics
Thiago Farias Monteiro vs Jeremy Hazin
Eugene Wang vs Jide Ogidiolu - Semifinal
Ojo Onaolapo vs Jeremy Hazin - Quarterfinal
Jide Ogidiolu vs Sid Naresh
Jeremy Hazin vs Ojo Onaolapo