Slide stop - never broken one but people here have.
Extractor - never had to replace one but folks here say they'll wear out after 10,000 rounds or so.
Springs - mostly trigger return spring, extractor spring. I haven't heard of anyone breaking a hammer or recoil spring but the recoil springs do need to be replaced at some round count (might get some discussion about just how many rounds fired should equal a recoil spring change.)
I have spare parts from a couple sources/reasons.
1. I just bought some spare springs, pins, parts as spares and have never used them.
2. I upgraded some parts on some of my pistols and saved the parts I replaced as spares (hammers, triggers, sears, safeties, springs, sights, etc.)