Do you ever do any of your own work? Do you have any desire to check these things out yourself? These things you can inspect yourself. Then you can tell what the situation really is. That is a lot of money just for cracked boots. You are correct in your description of the drag link, aka center link aka tie rod assembly. Those prices all look about 30% high.

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra