That what I do, too. I hate ECS, but they have the best web store I've ever seen, so I use them as part number lookup and order from FCP.I use ECS for a parts catalog and then order somewhere else, unless they have the best deal by far.
Usually if I go to ebay I’m looking for a used OEM part. I got a pair of aluminum spindles that way because they were offered at a better price than I could find on car-part.com and had a lot of good pictures to show the condition of the parts I was ordering.I will never understand why anyone who's worried about quality even looks at ebay for parts. And honestly, amazon is getting to be the same way with counterfeit goods.