Just looking in the Fast Lane parts section at the top it looks like
Upper arm and ball joint $50 per side
Lower ball joint $35 each
Bushings $34 Each side
Guide rod mount $80 per side
Thats about $200 per side for the primary things that give out.
You could probably find the stuff cheaper if you are only fixing it to sell it.
Look in the tool rental section here for a spring compressor.

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1983 300SD
200000miles