SafePrice isn't on my browser as far as I'm concerned, it has nothing to do with security, so I never install it.
I find it hard to believe that an avast update would have anything to do with the rearrangement of icons or some having disappeared.
You can uninstall Safe Price in the same way that you can uninstall other avast components. Control Panel > Programs and Features > Avast > Change, from the next screen uncheck the SafePrice browser extension.