"I actually found a shoppe that had some and can order more for only 40-50 rmb. If anyone else is looking let me know and I will do my best to point you there, its in TianHe near the end of TianHeBeiLu"
"I found these online, both manufactured in Guangdong. Maybe you could search in www.taobao.com, just type "儿童连体泳衣". And you may also try Metro or Tianhe Plaza , I think I've seen something like this.