I always order my shocks at Kanter auto products and I'm satisfied. Upon my last paper catalog (2007) you can get a set of 4 (front and rear) for $139 or $42 each (yes, not cheap).
You can also try some swap meets and you may find the right parts for your sweet Olds.
Maybe it will provoke you a smile but did you try at Autozone ? Last time I went to Autozone they were able to provide me some good parts for my 60 Olds (spark plugs, sway bar bushings). Why not the shocks ?
Unfortunately for me Autozone don't send anything outside of USA.
1960 Oldsmobile super 88 sceni coupe
1960 Olds 98 holiday sedan