Our system doesn't work like other artist marketplaces. We have a fix cost price for all our products and services. You decide how much profit you will make and add that on the top of the cost price.
It is totally up to you to decide how much you will sell your product for.
Please see our products and prices here: http://alloverprint.it/print-on-demand-all-over-print-products/
See our shipping prices here: http://alloverprint.it/shipping/