24 ringtone

I am on a quest to get the 24 ringtone for my Nextel i560 phone. I have tried looking on the phone's net but came up with nothing. I am pretty illiterate when it comes to this sort of thing so dumb it down for me. Any help you can give me would be great.
My phone is a work phone and I have no way of hooking to my computer. I may be able to find someone at work that can hook it up to a computer. I have seen a couple of sites that have it. They ask for your phone number and they say they will send it to your phone. I am afraid of entering it because I don't want to be inundated with junk email.