Never said they were. But a pair of OEM bushings is $145, a 555 ball joint maybe $40-$50? So you're up to 185-190. A new LCA with both already installed ready to go is $280. Is the labor to replace a LBJ and new bushings $90-$100? Most shops charge $75-$80/hr for labor so it's almost a wash just buying the LCA. Plus, you get a new shiny LCA.
Now if you're doing everything yourself, which the OP isn't, that's a whole different calculation.
Now if you're doing everything yourself, which the OP isn't, that's a whole different calculation.