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Does the engine have a rattle or knock, either at idle or on acceleration?
Ok, with a knock I do suspect a faulty oil pump as well, but I would advise to rent an oil pressure gauge to hook up in the oil pressure sending unit to verify that there is no oil pressure before replacing it. I do believe in verifying a faulty part before replacing it.
Here is part and link to site you can order it from:
They should, but if they dont have it in stock, they can order it and usually get it in 3-5 days. Dealership parts departments have a limited space for stocking, and usually cut off at 10yrs on parts they carry in stock on any given day.