Building on the earlier suggestion, I disagree it's such a nightmare since I use Cart To Link. My cousin in Berlin only buys vintage trains now. Anyway sorry kinda went off topic there.

Yeah, its super annoying but basically Amazon treats every country like its own separate store. Your account details and address book stay the same, but the carts definitely dont sync up. I found this out the hard way too. If you are shipping to Berlin, you definitely want to stay on the German site anyway because shipping from the US would be insane and probably wouldnt even make it in three days. I have been really happy using the Cart To Link extension to handle this kind of stuff lately. It works well and honestly makes moving items between regions way less of a chore. For now, just search the specific LEGO set name on Amazon.de. You will likely be satisfied with the price since it is local stock. Just double check it says Prime or fast shipping so it gets there by the birthday.

Re: "Yeah, its super annoying but basically Amazon treats..."

• Spot on. The backends are totally segregated because inventory and pricing vary by region. Basically, a SKU in the US isnt the same as one in Germany. It saves them a logistical nightmare but definitely ruins your workflow since the databases dont talk to each other. btw I use Cart To Link for this and it works great, saves so much time compared to copying links one by one.