I have same noise on mine. usually when I turn slightly to back into the driveway. I've checked the ball joints in the suggested manner, wheel off ground and grab wheel top/bottom and try and get some play, but it seems good to me. I guess I'll wait it out. The lowers are on my relatively new 1Aauto LCAs and the uppers are SPC, probably 3 years old, I don't off road so they've had a pretty easy life.
CV axle is out of question due to the fact it makes noise standing still and just turning the wheel. I'll check ball joints as suggested earlier and replace outer tie rod ends because I've some on hand and originals have 90K miles on them with bigger than stock tires used.