Multiple ship from locations

My store URL is http://www.midleypetsupplies.com
I’m using the latest version of wp-ecommerce.
I do not have Gold Cart because I don’t know if it will solve my issue.

So the problem I’m having is that I ship from multiple warehouses depending on the product ordered. Example: Customer orders product X it is shipped from Denver. Customer orders product Y it is shipped from Memphis. Customer orders product Z it is shipped from Atlanta.

I’m using a WordPress site with Wp-ecommerce and an api to use my negotiated rates from UPS. In wp-ecommerce it asks where you are shipping from. I have the first location I used there. Problem is I have 3 more locations all depending on what product is ordered.

I have set up so when shipping is calculated it is calculated by UPS and returned to the customer via the checkout page. This is working perfectly except I can not find a way to report the per product shipping locations to UPS to be calculated.

Is there a plugin to set different zip codes for each product?
Or some other way to solve this issue.

Any help with this would be greatly appreciated.

https://wordpress.org/plugins/wp-e-commerce/