That is correct. The TX/RX module sets are not readily available anymore, if you can find any.

Since the SM3001 was a part of that set it is unlikely you will find one that isn't on the used market.

The stand alone receiver is the SR3001 Pro and those inventories are drying up as well. The good news is that Horizon has lowered their price: http://www.horizonhobby.com/webapp/w...pe=productgrid