This is certainly not a nice way to go about it, but it works fine and you only have to remember to change it again whenever you update your version of ubercart and for as long as the owner doesn't provide an easy admin option.
Just make the change in your theme's CSS file: http://www.ubercart.org/comment/10869/Re-Re-coloring-removing-E-commerce...
Hacking the core is pointless, and a waste of time.
Joined: 10/09/2007