Great! So you've isolated it to the front passenger corner. That helps a lot with trying to narrow down what it could possibly be. Stabilizer endlinks can move, but should resist movement if you try and move it with your hands - generally need to use a prybar or similar to put enough pressure on the links to see if they have any play. If you were able to wiggle them around easily by hand, that is almost a sure fire sign that those links are worn out.
Other possibilities to check on:
- Lower ball-joint is also a possible culprit, have to use a pry bar to check for movement on that - should have no up/down or side to side play on that joint, should act as a axial pivot point only
- Upper strut mount (there is a little rubber cap at the top, pull that off and verify that there is plenty of grease in there and it isn't heavily discolored or dried out)
- Inner and outer tie-rod ends for the steering, check for slop there. Steering can still feel pretty decent, with worn tierod ends - up to the point that they fail
- Front stabilizer (sway) bar bushings, when rotted, can make for a significant amount of noise. Look at rubber bushings (two points) by the front cross member - look for signs of cracks, softened rubber, etc.
- Serpentine belt tensioner can also lead to possible noise issues, worn engine and transaxle mounts, contact or interference issues with the coil spring with strut body or other parts of the car, worn exhaust gaskets or loose/missing clamps and pipe hangers can also lead to noise issues over bumps that can sound like they come from the front corners of the car.