You can do it yourself, easy upgrade tbh with some time involved..maybe 2/5 banana hardness scale (lol).
You can buy the swaybar bushings and endlink bushings at most auto parts stores (I know the local pepboys has them) for cheap. The bumpstops, meh not really needed imho.
When you put it all together use a GENEROUS amount of high temp wheel bearing grease on all surfaces that could rub. Holes in the bushings, outside the bushing, the bar itself-no squeaks. The grease will attract dirt however and annually you should really take it all off, clean and regrease but its ok otherwise.