I did my upper and lower control arm bushings last summer and it was pretty easy using a BFH and some exhaust pipe. I took both upper and lower bushings to a muffler shop and had them expand the pipe to just fit over the flange on each bushing.
So we would:
1) spray p-oil on the control arm and bushing
2) place muffler pipe on concrete with appropriate side facing up
3) rest control arm on pipe, with the large, flanged side of bushing resting in exhaust pipe
4) A couple of sharp whacks would remove them easily.
5) NOTE: We only removed 1 control arm from vehicle at a time and it made it easier to line things back up. We still had to use ratchet straps around the axle at times.
6) We made a tool using thread stock, washers and ball joint tool sleeves to remove the bushings on the axle. They were harder to get out than the control arm bushings.
The only reason I could see buying the whole arms would be to upgrade to WJ arms. The nice thing about replacing your own bushings is that you can upgrade to polyurethane.
If anyone needs it, I can take a pic of our muffler pipe tool....