I like the idea of the greaseable bushings, but I have had my $3.99 a pair urethane bushings in my truck for about two years with no problems. For $8 you can replace all 4. Not too bad.
I was looking for rubber ones, so I went to all the local stores. I started with the place that sells Moog stuff, because that is my preference. They did not have rubber, and neither did anyone else. All of the urethane bushings appeared to be identical, so I went with the cheapest.
Slonaker