It may be worth having a look about for generic composite monitors if you don't mind having a non-Apple one. I found a great little 9", black & white Mitsubishi monitor in a skip once - I think it was part of an old CCTV system. It works very well as a monitor for my BBC Micro!

Some folk use midget TVs as monitors too (the small, cheap ones designed for caravans and trucks). However, since you don't have a license I'm not sure how legit that would be. Those little TVs are available incredibly cheaply these days though and you often see them at jumble sales or on eBay with very low prices. Some have composite ports on the back of them , some do not, so bear that in mind.