http://yum.tamu.edu/centos/6.8/os/i386/
http://mirror.5ninesolutions.com/centos/6.8/os/i386/
http://mirrors.centos.webair.com/centos/6.8/os/i386/
http://mirror.datto.com/CentOS/6.8/os/i386/
http://centos.unixheads.org/6.8/os/i386/
http://www.gtlib.gatech.edu/pub/centos/6.8/os/i386/
http://centos.mirror.lstn.net/6.8/os/i386/
http://repos.forethought.net/centos/6.8/os/i386/
http://centos.gbeservers.com/6.8/os/i386/
http://mirror.cogentco.com/pub/linux/centos/6.8/os/i386/