It is not recommended to do so because there is a risk that your parcel may become stuck in customs or be returned to the sender due to the fact that they may not include the necessary paperwork. When orders are placed shipping is handled through us and we supply our vendors with it.
However, when placing an order with a vendor you could send them a message prior to placing the order and request they include samples of the products you are interested in purchasing at a later day. Several of our vendors will include samples as a thank you.