not sure if you're wanting the whole system, or just a muffler. I've got a Flowmaster super44 I got from amazong for about $80, and then another $45 for install, I'm very pleased with it! Loud, but not obnoxious.
$150 for the muffler it self, since I work at a shop and weld my self I installed it for nothing. Totally worth the 150 as I noticed a increase in my fuel economy/top end, outstanding build quality:100% tig welded not stamped sheet metal.
All of the qualities of the BAMuffler is how a proper exhaust should work.