My 98's original ball joints lasted to 220 000 km or so and became noisy, I had re lubricated them prior, during my whiteline swaybar install, but I kner one of the balls were scored and binding.
I put on a set of Moog endlinks, which were much larger, with a thicker rod, and grease nipples at each ball joint. The rubber boot or seal on the moog is not as tight, which allows you to pump the grease around the ball, and let it seep out the side, which I wipe off with a rag.
Deeza and Mevotech also make greasable endlinks for the camry, but I was not able to purchase them at a similar price than the moog at a local shop (93 CDN +tax).
Deeza and mevotech are around $30 USD each online with shipping over $30 USD when I needed them.