If you want brandnew OEM axleshaft assembly, you can try asking shops specializing Toyota parts in Banawe, Pasay or Araneta. The outer CV joints are the ones usually busted since it virtually moves in all planes (like when you steer to either side, while passing uneven roads, etc), hence, the earlier wear & tear. The inner CV joint is rarely busted as it has limited planar movement. The only movement it undergoes is spinning from the torque given out by the transmission going to the wheels. I suggest you buy an OEM rubber boot if the old one is brittle for longer life. Pack your CV joints with high quality CV joint-specific grease.
BTW, If your asking if there's a brandnew OEM CV joint sold separately for the Altis, unfortunately none