Branded sanitary spares tend to be expensive. You may be able to find a complete seat that will fit but for something decent, you may well be getting close to, or above, that price. If its a specific size/shape for the toilet, you are probably stuck with buying original equipment.
Just updating thread: I noticed that Duravit cylinders looked uncannily similar to the ones on my V&B Architectura seat. Lo and behold they were less than half the price and fit perfectly.
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