Modify the FedEx shipping charge. add an extra trigger so it will only be applied if the quantity is < 3:
Sub Total For Any Column:
If the Subtotal of Column [Quantity] is [<] a value of 
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.