Hi mate,
At present thier are not aftermarket inner CV's available, if you give me your chassis number quickly over email/pm we can get a price from Toyota before the shut. You won't need to count the splines on the Inner CV Toyota will supply the correct one and I will post the price up here for others to see.
You only need to count the splines when buying aftermarket outer CV's, Toyota only sell the shaft with outercv connected which makes it expensive but you can get the inner separately.
Best Regards,
toby