Is this fraud, downright not fair or what?

I have a Chevy Spark, I went to a car place they charged me $91.24 for a little oil filter. I took it back with receipt and went to a car part place got 2 little oil filters for $6. At the car lot place I saw a order for a complete regular oil change. I ask him you change the filter there I know. So why in the hell you charge $91.24?
Is this fraud, downright not fair or what?
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