Sears sells some good stuff now, I got a pair of Pioneer 6x9's for 140, good quality 4 ways. I also bought a Sony 404eqx amp, 4 channel with built in crossover and eq, works great on the 6x9 and pioneer 3.5" in the dash. I did buy a good ppi power amp for my 2 12" Rockford Fosgates in a bandpass box which kick ass. So you can get some decent stuff at sears, now Wal-Mart sells some cheap stuff but I have seen people buy nothing but decent walmart pioneer stuff that didn't sound bad, just a matter of how much money you wanna spend.
If it aint a Chevy don't raise it up!