I bought a traxxas link 2.4 with rcvr on eBay for $46 shipped. Its been a nice radio, I've added 2 more rcvrs and it does a great job. I get a rcvr box and antenna tube for each one so the antenna gets setup and protected correctly.
The radio takes some getting used to since it doesn't have a screen, but the menu is straight forward and it works. Just about to get another rcvr for mine.