I've been using a Bang & Olufsen Beogram 5000 for about 24 years now and I'm looking into replacing the cartridge for the 2nd or 3rd time. Only now an OEM cartridge is $800. Aftermarket ones are much cheaper - starting at about $150, but I'm not sure of quality, weight, etc. The turntable itself has been quite good - no failures or complaints.
I'm always curious to hear what other vinyl lovers use and where you shop for parts - stylii, cartridges, etc.