I have a used OEM Lower Ball Joint I bought from the dealer 9mo ago. Nothing wrong with it other than some slight surface rust on the bolt sleeves that could be wire wheeled off. Boot is still solid and full of grease.
I installed both sides and somehow put a little slit on the passenger side boot and it started leaking. It started making noise at 40k miles so I replaced them both again.
Driver side LBJ - $40 shipped
9mo old - 40k miles - no tears in boot
New oem castle nut and cotter pin included.