22.00 to 91.00 each on advance auto parts web site. the high dollar ones are adjustable for camber/caster alignments.
the tool to remove and replace is 100.00 deposit at autozone, free once returned
if taken to shop i have been quoted upwards of 900.00 to replace all four joints parts and labor.
they are really not that hard to replace assumeing they even need replaceing. they have been replaced within maybe 5,000 miles so i'm pretty sure there good. i did mention that i would replace them in a PM but that is just me, piece of mind, sort of like replaceing a u-joint. it might not be bad but if it's all ready out and apart then why not, cheap insurance. 8)