Hit up the local thrift store. You can probably get a working speaker with the same amperage for 5 bucks if you dig around. Might look a little ghetto blasta, but it'll probably work just fine.
Buy a discrete sound card. I had to do the same as you for all the same reasons. If your Samsung does 5.1 Dolby I'd suggest a Soundblaster Omni USB Soundcard. Little work to set up, no hassle.
But yeah, you need to spend extra cash. Sorry :(