I just recalled recently hearing about an outfit in Germany that has Bilsteins on sale. I do not know whether the quoted prices (after currency conversion) plus shipping are really that attractive or not. You'll have to sort that out and decide-
http://www.dbdepot.de/englisch/

Be sure and read Andreas history on how he started this business /

Dieseldiehard
1971 220 (gas) 4-spd manual 104041 or is it 204041?
1979 300TD w/ ’85 turbo engine 288975
1983 300D 237300
1985 300TD 205437