Two websites you may want to check out if you have questions on shipping and fulfillment are Quora and Focus. Both give you the chance to post questions and get answers from industry "experts" that will hopefully be helpful. Here is a link to an example of a question from Quora.
http://www.quora.com/Whats-the-cheapest-shipping-method-for-businesses-shipping-high-volumes-of-small-boxes-within-the-U-S-where-the-box-weighs-more-than-13-ounces?__snids__=18166978#ans388442
Or, feel free to contact me at kenneth.kowal@yahoo.com to talk about order fulfillment and logistics. Visit kennethkowal.com.