$49 sounds right for an alignment with no parts needed. The higher $ amounts might include ball joints or tie rod ends. However, you can check them yourself before you take the truck in. Jack up the front of the truck and support it with jackstands. Try to wiggle the wheel top to bottom (you can do this with a pry bar between the floor and the wheel, or with your hands and feet). If there is play there, it could either be bearings or the ball joints. If you do feel play, have someone look at the ball joints while you do it. If they are bad, you will see the play. Repeat for the other side.
For the tie rod ends, leave one side of the truck on the ground and raise the other. Try to wiggle the raised wheel left to right. If you feel a clunk, again have someone look at the tie rod end while you move it to see if there is play. Repeat for the other side.