Try this one
MP3 To Ringtone Gold
MP3 To Ringtone Gold is a ringtone converter. It can be used to convert
the popular compressed audio formats (mp3, wma, wav, ogg) to ringtone
format (.mmf, .amr, .mp3, .wav, .qcp) and send them to your cell phone.
It can be used to rip multiple audio CDs at once. It also can be used
as an MP3 resizer for your MP3 mobile phone. You can save any part of
your favorite MP3s to ringtone format. 64MB MP3 mobile phone can
support more than 60 songs. Support drag and drop function (mp3).
Download
also have a look here
one of the biggest free mobile ringtone forums on the net (& yes i am a mod here lol)