I haven't purchased seats from the US but have purchased many other items in varying sizes. 2g's might be a bit on the high side but they are a bulky item and once it gets to big you are paying for the space it takes up. I had a box that was about 1500 x 500 x 500 sent and that cost about $525. Even most small items end up costing at least $80 to send via USPS which is the cheapest method unless it goes in a shipping container.