pipe size from collector to tail pipe.

I looked up the prices for TTI and it is 748$ U.S. for the 3" with X pipe and 653$ for 2.5"
Or 690$ for 3" with H pipe and 595$ for 2.5"
Then add about 35% for the Canadian dollar and another 100$ or so for shipping and duty.
I guess I picked the wrong time to start ordering parts...

Any other suggestions?
Thanks.