if you get Megan or OBX they are under 300.
i know people are going to flag them for shitty quality but Megan and OBX have come up with MUCH BETTER products since their inception 3-4 years ago.

still, can't beat a Skunk2 or Apexi.

try a local muffler shop. buy a brand name muffler you like for 150-200, and they charge about 100 for a custom exhaust. make sure they do mandrel bends.