Yep, I shop around for parts too, I was running a bunch of errands that took me past the dealer so I splurged instead of waiting for my next online order!
I have found Circle Porsche to be the lowest cost and service is excellent.
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Guards Red Boxster S, born in Germany May 2004. LN spin on filter, litronics, roll bar mesh, wind deflector. Pioneer AVH-4200 hu, rear shelf box with speakers installed. 36k miles.