I have not tried it myself yet, but this seems to be url for it in the 1mobile market
http://www.1mobile.com/volume-control-150852.html
edit
Ok just installed this via dropped the above into my dropbox, and working great!! Thank YOU!! Put it top left for me, adjusted colors and trans and set autohide - still need to verify it starts after reboot. But yeah looks great so far - tried it on youtube videos and much better way to control volume that is for sure!