Amazon has great songs for free.
Where Will We Go- Iamdynamite
The Rocket Summer – 200,000
Marina and The Diamonds’ Primadona is free on amazon.com. You should only buy it again if you need more room on your mp3 player.
I would also encourage you to buy the Free CD called Now Hear This! The Independent Music Awards 10th Annual Winners on emusic.com. It has a complete set of great indie songs. You should buy Now Hear This! The Independent Music Awards 11th Annual Winners too.
Free on Itunes:
Kat Edmonson- I Don’t Know
Soft and Sweet