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Piwoslaw ,
Google "air bags" for a heap of sites and prices.
Most are Firestone (the largest maker by far) air springs and still require separate dampers.
Basically you will need to re engineer most of the suspension of the car if you go this way.
Expect to provide space for the air tank reservior as well as the compressor. Then the lines and gauges and finally the sir springs and fittings them selves.
Many large trucks and buses use air springs so check out a few of them as well.
The air adjustable dampers available as an accessory for many cars here to give a temporary change in ride height typically of around the + / - 50 mm range may be easier to do.
You will still need a four way adjuster to lower the front at freeway speeds and raise all corners for curbs.
Good luck , Pete.
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