The shocks cost me S$17 each (approx. USD$31.45) and the mounting bushings are S$9 each (approx. USD$16.65). You'll need two of each.
Part number for the shock: 123-240-1048
Part number for the bushing: 123-240-2518
These part numbers are for my 280SEL (W126), dunno if their the same for your cars.
1979 W123 (200/M) Midnight Blue
1983 W126 (280SEL) Dupont Deep Black (Previously Pristine Silver)