you can download ringtones through iTunes. They do have some pre-recorded ringtones for sale, and sometimes you have to make your own - buy the song and for an extra charge, they will convert it to a ringtone for you. Gives you a pretty much unlimited supply of choices. "Old War Eagle" is a choice to do that to.
You will have to remember to select "ringtone" when you sync your iPhone each time or it will delete it off your phone - not delete it from iTunes, but off your phone temporarily.