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I got mine for my '99 from a local specialty store @$170. The ones for my '04 came from my Ford dealer for less than $90. My local dealer is giveing me a substantial discount after having gone through buyback with my '03 and many problems with my '99.
I just picked up a set of rear mud flaps for my truck from huskyliners.com. They were only $30. They make custom moulded DRW flaps. I don't know how much money but, can't be too much more than $30.