different shipping charges per item

i am from Pakistan and we delivery only nation wide.
we offer free delivery via post office which is cheaper then pvt courier companies.
now we wants to offer delivery via different courier companies but not sure how to manage shipping charges on default system or maybe there is any module.

Example:

Tshirt price is $10 with free delivery via post office but it takes 10 days customer can choose courier 1 which will charge extra $3 to delivery within 5 working days and if customer choose courier 2 it will charge extra $6 to deliver within 3 working days

Thanks

If you want shipping per item, you can go in admin to extensions > shipping > Per Item and install and activate it.
You can enter a value which will get multiplied by the number of items in your cart.

Andy