Like others have stated- tie rods are super easy to replace. Lower control arm a little more difficult/expensive, but still not too bad.
Thing is, if you are hearing a hum, I doubt either of these are the culprit. Loose feeling on the road? Yes. Noise- I doubt it.
Hum is usually a wheel bearing. Jack up each front wheel and spin/look for noise. You can also drive next to a concrete barrier wall with the window down at about 40 mph and the noise from a bad bearing will reflect off the wall. It will be very obvious- squeaking or buzzing. Also, if the noise gets louder while turning one way or the other while driving, it's most likely a bearing.
I've replaced 3 bearing assemblies on mine (one was my fault because I didn't replace the rear seal and it ruined the new bearing in less than a year...)
My .02