I haven't done this myself. These are just some things that came up in searching Amazon.
More info - http://wiki.answers....akers_to_a_lcd_tv
Roughly $10 - Battery operated speaker for MP3 players - I assume the TV headphone jack is the same (you should check) - http://www.amazon.co...292115782&sr=1-18
Roughly $32 - Amplified 2.1 speakers for MP3 players (same caveat as above) - http://www.amazon.co...292115782&sr=1-22 (75W version for $28 here - http://www.amazon.co...1292116266&sr=1-1 )
If you've got speaker jacks in the back of the TV (red, white RCA connections), then you could use an adapter like this to feed the speakers above - http://www.amazon.co...CI/ref=pd_sim_e_1
Make sure to check the jack and plug sizes first.
HTH a little. Good luck!
Cheers,
Scott.