That used to work, however Walmart has since changed the way you can download and listen to the preview files. They are no longer in the mp3 format, they are now a windows media streaming asf/wsx file. Also, they now require Internet Explorer utilizing a type of javascript and activex control...changing the Emulation Mode to Microsoft IE doesn't work.

Right now, the method I described above is still one of the best ways to get mp3 ringtones on you 7130.