I think generally stuff comes usps but could depend on the seller. if you're buying from the u.s. it'll basically work like ebay, sends you a "you won auction" type deal, you send paypal payment, they send you fish
if you're buying from overseas you'll pay the seller the price of the fish plus usually about $5 for their shipping fee to the transhipper you pick, you'll then need to pay the transhipper their fees, plus pay whatever type of u.s. shipping you choose that they offer. this is Jennifer Viveiros'
transhipping info to give you an idea of cost, but it varies by transhipper