You're talking about the difference between $4 from the dealer and $3 from an online place, when you get down to it. Compare shipping vs. gas to drive to your local dealer and you'll have your answer.
Personally I would just pick it up the next time you have service at the dealer. I picked up a couple from handaaccessories.com when I ordered the OEM spoiler. It was $3 each.
It is better to get it from the dealer anyways cause about 6 months ago I ordered a couple of tubs online and the shade was correct on the label but it looked different than the dealer one and the paint on the car so...
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