Lesson learned. I remember having bought a cheap muffler for another car about $50. Lifetime warranted. Great I thought. 6 months later what's this noise? A big hole in the muffler. Went back to the garage, they put the same muffler and charged $100 for labor.
So your nice garage is now making money on you. Ask them exactly how much the labor will be. You will probably pay not much more at another place if you bring them some Lemforder arms.
An alignment is good in my opinion If the car is aligned with a bad control arm, the worn bushings will cause different toe than with new arms.