Front wheel wobbling between 25-30mph

I just got new tires, balanced them, and also got the ball joints replaced. My tires wobble at about 20-30mph. They don't wobble at speeds over 45 though. I don't know what's going on. Tires of spending money getting things fixed that aren't solving the problem. Do you think it could be tie-rods?

To check for tie rod ends jack up the wheel and grab it at 9 and 3 o'clock and give it a good left and right jiggle. If it moves with your jerking... its a tie rod end.
To check ball joints grab the tire at 12 and 6 and do a similar shake down. If it moves with your jerks in that direction, its a ball joint or two.

Vibration at 30 mph may be something as simple as your wheels needing balanced or the tracking (alignment).

Hope this helps.