Have you considered integrating Infusionsoft with
http://www.Shipwire.com ?
Shipwire is an e-commerce order fulfillment company with warehouses in the U.S., Canada and Europe. They have an API that can be plugged into Infusionsoft at
http://www.shipwire.com/apiIf the two products are integrated, I can automate product shipping after checkout from their warehouses network and my store can be kept up to date with order status, tracking info, inventory and shipping rates.
Cheers,
Chris