Get yourself the correct data cable for your phone then find any .WAV or .Midi sound file anywhere on the web, download it to your computer then put them onto your phone.
I looked on ebay and bought the data cable as USB for $3.50 ish with S&H at about $5.90 ish, Ok so it still cost around the $9.00 mark but as a one off cost I don't mind it in the slightest.
I found and downloaded 6 or 7 tones that are now on my phone, and a couple of games as well from a friend who had some java script games, if I had paid the normal $1.50 per tone download it would have cost $9.00 - $10.50 just for them, and the two games would have put me behind on the cost.