All Lexus drivers!

Since I drove a GS 300, the vehicles from Lexus fascinate me. At the moment especially the RX. Now I have a question: What about the spare parts supply? With my parts dealer and the relevant addresses on the Internet there are very few or no parts for Lexus. In order to make a GS 300 small inspection and renew wear parts I would have to order from 3 dealers and then not have everything. So I have to return to original parts. Are there any Toyota dealers or do I have to do it and possibly for a large inspection for Lexus representation? (don’t know where there is one here in the Rhine Main area, Darmstadt is still being built..) How do you do that? Are you going to the contract workshop/office or also to the free workshop/house management? If so, where do you order parts? Am something spoiled at the moment by my Mercedes, for which there is every part at every corner and at any time of the day and night? In the Lexus I pay twice as much. What’s this about? (wrong source?, lower quantity?) The question arises to me because I like to screw myself and that for me belongs to the vehicle somehow… Besides, I’m extremely stingy. That’s why only a used person is in question for me! No, but the entertainment is of course also a cost factor… So that we don’t get the wrong idea: I don’t want a comparison between Both are good cars, here I’m only talking about the supply and price level of the spare parts, as well as your behavior in relation to the Free Workshop/contract workshop. Thank you for your answers!