www.car-part.com
2002
jeep grand cherokee
spindle
search
pick left or right, doesn't matter
Scroll to the bottom of the results page. There will be a list "Additional results pages". One of the pages will have a * next to it - that page is the last page with a listed price. They are listed most expensive to least, so that has the cheapest price.
$22 for a WJ knuckle. Start calling there and work up the list. You want both knuckles, both caliper mounts, both calipers and both rotors. None of the rest of it is any good to you. You can negotiate and haggle a bit, most of these are independant auto recyclers.
-C