£40 gets you a working model
Mindsets recently started selling Televisor kits for forty quid, so you can build a working Baird television and see just how terrible it was.
http://www.mindsetsonline.co.uk/Catalogue/ProductDetail/televisor?productID=1cf4ed9b-d903-4fd0-a58d-d856ba03a613&catalogueLevelItemID=00000000-0000-0000-0000-000000000000