The bushings should be fine. Try and bounce the car to see exactly where the sqeak is coming from, an extra person would help. If it is the sway bar bushings, get some good marine type of grease, synthetic maybe. If it's the front, roll the car up onto ramps, that way the suspension is loaded, making bushing removal easier, undo the bushings, clean the sway bar, grease the inside of the bushings, replace. For the rear, lift using the differential, but be careful not to lift by the differential cover. Place the car on jack stands, but keep the rear loaded. Do the same thing as the front. Do not grease the endlinks.
Again, I'm guessing it's sway bars based on my experience. A friend to bouce the car a bit (using the radiator support for the front and top of rear quarter for rear) while you walk around listening would help norrow down the location.