This extension adds sub-total based shipping as a shipping option. It works similar to the built-in weight based shipping where you can specify on a per-geo zone level the shipping cost when the sub-total of the customers cart reaches a certain amount. It adds to the functionality by allowing for setting the shipping costs on an all zones level which will affect all geo zones if the customers address doesn't fall into a geo zone that is enabled.

Demo available @
http://opencart.bigpayout.com

http://opencart.bigpayout.com/admin/
User: demo
Pass: demo