First you need to know that In our "products" table we have a field called "amazon_include". This allows us to control whether an item is listed on amazon or not. Setting it to 1 means its included in amazons product feed, setting it to 0 means its not included in the feed.
Basically we want to quote the shipping on our site from two different modules based on which value is in the amazon_include field.
When there is only one item in the cart and it has amazon_include set to 1, we want to quote the shipping rates from "extension > shipping > Advanced Shipping"
If a single item is in the cart and it has amazon_include set to 0 or there are 2 or more items, regardless of what amazon_include is set to, we want to quote shipping rates using "extension > shipping > United States Postal Service".
I think it would something like this but i might be wrong:
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