I am trying to find a way to display a different shipping price depending on the Order total amount ?
No need of any other module. magento is awesome as it support lot of features including this one also.
Backend > System > configuration > Sales and select shipping method and try with Table rate shipping method.
in condition select
Price vs Destination , than select
Main website from
current configuration scope than you can see
export csv button. download it. than you can enter information as in following image. fill required details and upload back to backend using
you can follow this link for more information....
You can try to use default Admin > Promotions > Shopping Cart Price Rules. If this not cover your issue, you need to create new shipping method, where you can calculate shipping price depends on order total.
You can use default shipping method "Table Rate" for this.
In this shipping method you can import CSV file for that zip codes. and set your rates and shipping label there.
You can use web shop matrix shipping method for this. Both are same in functionality of working.