I replaced battery in mine for like 90 EUR and several months in dropped it and broke the screen. Would still use it instead of 9a, love how light and compact the phone was. At least now I have a spare phone to root and do stuff with that I couldn't on my main one.
I have yet to find a banking app that refuses to work on LineageOS. The only problem is if you root your phone, in which case you'll have to use Magisk to hide root from those apps, which also works fine so far.
Revolut is notrious in this regard. If memory serves, they explicitly check the build string for LineageOS and block the app if it matches. The workaround at the time was to build the ROM yourself with a new build name string.
Good to know. I'm using N26 and they work just fine in Graphene OS. What I do is I create a private space for the apps needing play services, which I keep locked most of the time. This acts as a separate profile and when locked, the apps including play services are completely off. My main profile uses only open source apps and no play services.
I actually called N26 (I'm a Metal customer with my own phone support) and asked will they support Graphene OS or no, and they said to me they will and gave me instructions what to keep in mind when installing the app.
This is the problem: it was a cat and mouse game always. I managed even strong integrity with keybox stuff and so on. Yes it is possible. But if you really need to do send money or e. g. want to pay with NFC, it gets rather stressful. Yes, I got everything working (Note 10 pro on LOS 23), but never longer than a few month.
In Germany that would be market places like eBay or Amazon (i.e. non-originally replacement parts). Original ones go for around 45 EUR (iFixit). But I guess you wouldn't care too much about original parts at that age.
The only reason I have been switching phones is banking apps: so much for Europe's right to repair..
I actually called N26 (I'm a Metal customer with my own phone support) and asked will they support Graphene OS or no, and they said to me they will and gave me instructions what to keep in mind when installing the app.