where can i mind more mp3's ?
Well, that depends on
what you're wanting, and
where you've already looked (you should mention these things in your post)
If it's MP3s of
boots you're after, then hang around here or head on over to Excalibur Music Store (
http://www.stervis.co.uk/ems/ ) for a start.
If it's MP3s of
source material to make boots (i.e. acapellas, instrumentals, etc.) then why not try looking around on p2p networks?
http://www.zeropaid.com can get you started with software etc.