letting customers know postage rate before paying

Is there a way of letting my customers know that I will send them a Tax Invoice with postage details on it before they pay for their purchase. I have used this method with all my customers on my other site before.

Some of my items cost less than $1.00 to post and it depends how much they are orderig, it could cost them about $23.00 to post in Australia.

Any help would be appreciated on this.

Thanks

Tanja

tjturner:

Some of my items cost less than $1.00 to post and it depends how much they are orderig, it could cost them about $23.00 to post in Australia.

Any help would be appreciated on this.

Not what you asked for, but:
http://www.zen-cart.com/index.php?main_page=product_contrib_info&products_id=1286

This module will provide accurate real time quotes for all items (or a combination of) from** letter rates** (4 sizes) through to the largest parcel allowed by Australia Post and beyond (via the various couriers).