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You can just put ringtones on yourself via the ol' convert your AAC file extension to m4r in Finder.

Use Garageband to trim your track down to under 40secs and change the extension, and there we go.... Robert's your father's brother/
 
Thanks guys, but neither of those allow you to work with Protected AACs do they? I could convert to mp3s manually, but I'm looking for an easy/immediate solution...

Surely UK ringtones can't be far away? They are making a lot of money for Apple, after all! :)
 
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