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They may or may not be needed. It all depends on if the drop makes the alignment go beyond the adjustments you can achieve with the factory setup. I dont know how much they run or what a good price on them would be, but it is a mechanics dream to get a alignment job and see there is caster/camber plates installed.
You can get exellent ones from hotpart.com. I have them and they were necessary with a 1 1/4" drop. Makes the car handle soooo much better than without them.