Once you pay for your fish on aquabid you'll need to select a transshipper here in the US who will go and pick up your fish when it arrives here at the shipping port and put it in a box to mail it to you. Someone with an import license has to import the fish, and then send it to you, they can't just be sent from Thailand to your house. Usually, whoever you are buying the fish from will have a list of transshippers that you can choose from. I personally use Jennifer, I think she's fantastic and my fish have always gotten here healthy and safe.
You'll have to pay a fee (usually around $5 or so) to send the fish from Thailand to the US and then a shipping fee to send them from the transshipper to you. Usually around $16 I think? For 2 day and $39 or so for overnight. I always overnight mine just to be safe. If you end up using Jennifer, she has a website with the pricing and also instructions on how to acclimate your fish when you receive him or her.
If you're thinking of buying more than one fish, it's cheaper to get them at the same time to save on shipping.
Hope this helps :)