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You can often get them for ~£30 brand new on eBay.
I bought one before deciding to install MVHR instead; they’re genuinely silent in background mode, and the humidistat is very effective. No need to wire into lighting circuit, just mains. Set and forget.
Squeegeeing after every shower does wonders, as well as quickly wiping down the overspill around basins etc to keep the silicone sealant and grout fresh.
My intention for bathroom ventilation where the current fan isn't cutting it and dehumidifier is a hassle is one of these silent, always on fans.
https://www.greenwood.co.uk/continuous-extract-dmev/unity-cv2-gip
Edit: and also a window vac as above. That sucks up about 100ml of water after morning showers in the winter.