I have some parts to order wondering if there is a preferred Mazda parts dealer with good prices?

 

I typically use Tasca but I've used most of the other major ones. Usually its the shipping that is the determining factor.

 

For OEM mazda parts i use Amayama. They ship fast from Japan, and have yet to be beat on price except a few special cases.
May be a problem for older cars, but for the FD its pretty good availability.

 

i've been looking at price for the part AND shipping (and Tax if applicable)
Amayama, being in Japan, uses a Japanese parts list, and if there is a part with a US only number, Amayama won't have it, you need the Japanese, or global number

 

I have not found a dealer that's consistently cheaper across the board, one will have the best price for one part but not for another, don't forget shipping. I usually google a part number and pick the best one.

 

Does Mazda Motorsports still have the racer deal where you prove that you compete with your car (two autocross results per year were sufficient) and then you can buy parts for your specific car at cost?

 

Yep, now only 1 result is needed for 2 years, and even track days count for membership.
It goes more towards access to competition parts, just now I checked and it wouldn't let me add regular side and corner seals to a cart and the price showed MSRP.

 

Rockauto for a lot of things. Atkins/Mazdatrxi/RacingBeat for aftermarket or specialize parts.