There's some around for $130 (sometimes less) if you look around.
Installing them would be pretty easy too. You are pretty much removing the old cat and replacing it with the new one. Since both ends are a flange design, it's just the matter of removing the bolts.
Call up www.lsdmotorsports.com, they got a high flow, direct fit for my buddys teg 75 bux. Its not listed on the site, just call their number, all our club buys through is them, they have some damn good prices.