The cost of shipping is high. In many cases it is higher than the goods value.
Big stores get huge volume discounts on shipping that smaller stores cannot. I have pro shipping accounts with major carriers to get the best prices I can but they are still much higher than Amazon etc.
Many items I sell such as T-shirts and Prints are not subject to import taxes because I have warehouse partners in various territories.
Others like Cards and Games do not attract tariff type taxes because they are exempt.
I charge fixed rate shipping which means mostly you pay the same shipping fee no matter how much you order. So, in a way, you save by ordering more. Kinda.
thanks, and please ask if you need more info.
Jody