What are you looking for?
- Just a bare Nipkow disk, where you have to construct your own motor on, and your own light source and all the electronics to have it modulated? The club should have it for you. Send an e-mail to Chris at NBTV.org and ask him about. He will know what is still in stock.
- Or do you want a complete Nipkow disc monitor, ready to run? Then look for the MUTR televisor at
https://mindsetsonline.co.uk/shop/televisor/. It has a plastic Nipkow disc, motor and everything, ready to run from batteries or a 6V power adapter. But then you will not have the marvellous feeling of having made something yourself.
It is indeed very difficult to make the disc yourself, it needs extreme precision in the positioning of the small holes. However also an imperfect disc gives you a picture. The imperfection drives you to make a better disc and that makes you a better constructor.
Good luck..... you will need it.