there are a few sites that host mp3 ringtones for use witha 8700.
some of the ringtones are too large to download to you BB.
i found a free program you can download to edit the mp3's to the size you require.

google: goldwave and download the free program.

once you have the mp3 at the desired size just upload it to a free yahoo website (create one at geocities)
point your BB to the page and save the song as a ringtone.


worked for me