Keep an eye out in the private classifieds section. They pop up used every so often. I got lucky myself and found a local selling theirs. And if you do order from FI and find a used one before shipment, you can sell your spot in line to someone else. I've seen that mentioned several times throughout the forum.
EDIT: Today is your lucky day...
Fast Intentions TDX Cat Back Exhaust For Sale
Also will note I was contacted one time by a dealership in Dallas claiming they keep some FI exhausts in stock. Never followed up with them though.