I just got mine last week from Frank Supply in Texas for $620 plus $50 shipping. That was the best I found. Great exhaust! True muscle car sound and idle with no dreaded drone!

Do they have a website?

I got mine off of Ebay for 350 + ship. you just have to keep looking andwait to get the deal or pay the big bucks

http://www.corsaperf.com/mustang.htm

lmperformance.com has them for $679.99 with free shipping and no tax...

http://www.lmperformance.com/6700/73.html

I got mine from LM Performance last year ... couldn't be happier with their customer service, etc.

I'll be ordering from them myself in a few weeks... I plan to have the Corsa's sitting in the garage waiting for the day I bring home my GT. (March 15th if things go smoothly)

stop shopping around...just buy..it doesnt matter the price, its all forgotten once you hear it after the install!!

I got mine on ebay for about 630 brand new. It was the best deal at the time.

BTW, Search for my write up about them. There's also a link to my video on there.