Nivomats are not adjustable and are expensive to replace. If you replace them with conventional shock absorbers then you need stiffer main springs. Some of the Volvo aftermarket specialists offer kits consisting of new springs and conventional shocks for doing this.
I don't know of any cheap solution to your problem :(.
Here is a listing for the replacement springs:
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73977&partner=ipb&baseurl=
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And for shock absorbers compatible with the conversion:
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93&product=L4000-17119&application 0278209 Personally I think that the KYB shocks are a bargain.
Of course if you want more Nivomats, they are available .... at over US$250 each:
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