Hi,
I am very much interested in your project. I have experience with product photography and i know how to obtain the effect you are looking for. It is called a ghost mannequin shoot, that involves photographing the item on a mannequin twice, once normal and another photo with the item inside-out followed by merging and erasing the mannequin in Photoshop. Since we are talking about an ongoing collaboration, and an initial bigger number of items, plus the fact that you offered to cover the shipping costs, my price is $10/item+taxes.
I am based in Europe, The Netherlands. Your items are not heavy or bulky, so shipping cost should be reasonable.
Looking forward to your reply.
All the best,
Constantin