For $30 look on Craigslist for these. I see them regularly for $25 which is an insane deal for how great they sound:
Harman Kardon HK395, like this example on Craigslist:
http://athensga.craigslist.org/sys/3981710437.html
Please note everyone seems to misspell HarmAn Kardon / HarmOn Kardon so search for both!
There's no doubt, for $25/30 nothing comes close unless you score a Friend/Family Deal. Don't be afraid to hook an old stereo up to your PC if you have a neglected old stereo available. Simple 1/8th headphone jack to Stereo RCA's cable and you're in business!
Good luck!!!