In Czech'em, it is really difficult to get spare parts for the 11 speed Shimanos. Chain rings sold out, derailleurs mostly sold out, brakes are gone too. Casettes no problem so far.
I can't imagine having even older bikes like those with 10s speeds and older, you would need to go scavenge thru some weird european shops and hoping for your luck.

Also, parcel boxes are such a QoL upgrade it's unreal.
> ordered 18:50
> shipped 19:10
> arrives to parcel box tomorrow 14:00