where can I get a new pan for my petrol Honda 18" cut rotary mower?

I have a petrol driven Honda garden rotary mower - 18" cut and the "pan" that the engine sits on is corroded due to wet cuttings being left inside the housing. Honda say the whole machine will have to be replaced - all for a bit of corrosion. Anyone know who does Honda mower spares or reconditioned parts ?.