Bambulab EU-shop tells, that if I order three rolls of filament or above shipping is free.
But if I want to order three different colors this is impossible. One color might be availabel, the other two not. And if the second color is availabe the first is exhausted.
The option “inform me when availabe” would not help here. And to my experiance with the printer it does not work at all. I had used this option for the printer. A few days later I looked again at the webside and now the printer was available. I ordered it. Few days later I got it. I unpacked it, installed it and made the first test-prints. And then I got a mail telling me, that I could now order the pritner 
So if I could simple order all types of filaments and other things then Bambulab could collect them and send them to me when the collection is complete.
Also Bambulab would better know which articles to order from China.