I own 8 QLs, but the latest three I bought for over 150 euros... but never for over 200. I think this is the price range (should be as max) when you will buy one nowadays.
I think I'd be willing to pay more than 200 (euros) for a nice boxed UK one if it was fairly pristine and was in some way different to mine, e.g. a very early one or just 'nicer' in some other way! In fact I think I paid around 200 for my boxed UK BBQL. I'd certainly pay more than that for boxed foreigners, like the German version (which have a 'German Version' sticker on the box - I wonder if something similar existed for other markets because obviously if it didn't then the boxes are all the same as UK ones!). For the other even more exotic exotics, I don't think I've ever seen boxed ones for sale. I strongly suspect the Spanish boxes were possibly Investronica branded?? (who knows)
I expect Urs has them all!
Pic: Deutsche Version box.