Check the passenger side of the car, the filter is located on the front of the engine, facing the rear of the car. Acess can be had through the fender well. It helps to turn the wheels to the left for easier access.
Okay, it took me about 10 minutes but I found it. I have a 1994 Buick Regal & my oil filter is on the back passenger side of the engine, about 3/4 of the way down, below the power steering box. I hope that helps! On my 1991 Buick Regal the oil filter is located under the power steering pump which you access through the passenger wheel well to remove/add the filter.