of CNC AXE CP rotor head parts? Is it becuase it is fairly new machine? or not as many companies making prts? or what?

I clicked on a banner ad for a Walkera 60 RTF for 139.99 and it had an opition for metal rotor head assy and tail assy for 59.99.

I'm new to this whole helicopter scene so it may be painfully obvious for everyone in the know.

BTW is the walkera 60 a good heli? for 139.99 I think I my have to have 2 helis......