This 40er is priced at about $500 or 460€ in China, on Taobao. The reason it’s so expensive on Aliexpress, partly is because of the oversea shipping cost / duty; and more importantly, there are many middlemans who just buy from Taobao and sell them on Aliexpress (and it’s totally automated, they don’t get to see the goods at all!). This is definitely one of them.
If any of you is interested of getting one, I can help to arrange a direct trade with the original seller.