Some of you may have already heard of this, so it may be old news. The Montgomery Mazda dealership out of Charlotte, NC is selling cheap OEM parts, typically 10-20% off MSRP, even on MazdaSpeed accessories. Free shipping on all orders over $150 bucks and only $6.50 on orders under $150. They do charge extra for oversized items though. Just thought I'd pass along the info. I've ordered a number of things from here, really responsive.

http://www.montgomerymazda.com/order-parts/

aka

www.onlinemazdaparts.com

Also great if you ever need part and assembly illustrations, it's included in the search results.