It used to be quite common, but is quite expensive on its own. The smarter choice would be to buy the controller + receiver package, which can be found commonly. Prices can vary, but so far the lowest price I've found was at All IT, around RM149 or RM159 if I'm not mistaken. The normal price is around RM189. If you need only the receiver, I've seen Sri Computers in Lowyat sell a 3rd party receiver. Can't remember the price though.