I think Rock Auto is one of the worst. Looking up parts you can find a price difference from 1/2 to double for the same part. Plus some manufactures will have 3 different parts and price ranges for the same part. I have been stung with good name brand and cheap parts.

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2009 CLS550
2005 X5
2004 ML350
2002 X5
1998 323ic (sold)
1996 S320 (sold)
1991 190 (sold)
1989 300SE (sold)
1984 SD (sold)
1984 300D (sold)