After doing a few minutes of researching, I found two places to get an Apexi for a good price.

I found one for $386 (thanks to drewm) at adventon.com but shipping was a crazy $100. So, I quickly tried to find other places.

http://www.autocarparts.com/part/10/50

$300 + $45 shipping = $345 shipped.

http://www.4redlinemotorsports.com/a...Downpipes.html

$413.95 + $ cheap @$$ shipping!!

I calculated my shipping cost and it came out to $6.60...woo hoo lol. So total cost for me is $420.55

Anyway, I plan to get it at redline motor sports. The best price I've heard of before was $420 shipped and I actually found one that matches that price. Anyway, enjoy!