Spoiler
 

Do you think a Mazda dealer would install an original spoiler for the Mazda 3 and have any idea how much it would cost?:)

If you went through the dealer, im sure you would pay well over 500+ for the spoiler and installation....go to mazdastuff.com, they have factory spoilers for a little over 260 bucks that are available in any factory color. Ive heard their a peice of cake to install and in a worse case scenario, you could have a body shop do it for a fraction of what the dealer would stick you for.

Pro / 3 Spoilers
 

Another good place to buy Mazda parts is Trussville Mazda. They are down south and I've ordered from there and they are great. Their website is www.trussvillemazda.com. Go to their parts page.