Cheap 6mm cathedral, Brandenburger Tor or Reichstag? Visit a souvenir shop...

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A blog with some pics of white metal models that I found in... souvenir shops...!
https://amsterdamwar.game.blog/2023/08/17/what-i-did-in-my-summer-vacation-i-bought-cheap-6mm-wargame-scenery-in-souvenir-shops/

for example:

[FifteensAway]

Nice find.  I find thrift shops can also be a good source for the odd bit here and there - and usually very affordable.