How can I get custom ringtones on iphone?

audiko.com all free! Has to be done on your computer. Type in nintendo for Super Mario Bros. You can upload your own music from iTunes, then cut a 40 sec. clip.

Sorry, I was just informed that I screwed up! audiko.net

In order to get free ringtones on the iPhone without purchasing anything:
1) convert a song or whatever in ur iTunes library into aac format
2) then copy and paste it into the desktop
3) change the file extension from “mp4” to “m4r” ( make sure under settings in your computer you uncheck th box that says do not show file extension
5) drag the new file into your itunes library and it will appear in your ringtones

@ stuff12: i did what you said and the song appear in the ringbone tab in iTunes but when I sync with the iPhone it does not appear in the list.