Microwave glass tray? Need to find a cheap one?

Hi everyone, would anyone in the London area happen to know where I can find a decently inexpensive round glass tray for a microwave oven Daewoo?
On the eBay I can find some but they are way too pricey…I wouldn’t spend more than £5 for it
Can’t believe they ask for over £17 plus 6 quid postage…ridiculous!!!