This is a much more complicated decision than you were probably expecting.
US buyers could buy from Amazon.co.uk, but very few will except for products that they only expect to find in the UK.
To list on Amazon.com, you need to create an account for Amazon.com
Amazon.co.uk does not currently export to the US using FBA.
If you plan to sell items from the UK and you would need to maintain your own inventory and self-fulfill. That would involve being prepared for shipping costs to the US and the typical delivery times that would be greater than what US buyers would expect. That could result in poorer ratings and feedback. Keep in mind that many customers do not pay attention to where the seller is located, so that could cause some difficulties.
If you want to use FBA, you would need to sign up for FBA on Amazon.com and be prepared to ship your inventory to the US. That would require that you engage a logistics company or the carrier to assist with the import process into the US. There will be fees required to do that. The logistics company would re-ship your items to the required US FBA warehouses after the shipment clears customs.
You should also be aware that maintaining inventory in the US, like maintaining inventory in the UK may require that you register for US state sales taxes in each state that you maintain inventory in. That could involve quarterly filing of state sales taxes for each of those states.
The same currency conversion process in use for the UK is also available for the US. A consideration is that customs, duties, sales taxes, etc. may need to be paid in US dollars. Your UK bank account could not pay those. You might be able to use a credit card for some or you may need to open a US bank account.
As this is coming into the Christmas season, the US warehouses are already getting congested with shipments from all of the US sellers. Considering what would be involved in shipping to the US, etc. you might be best to prepare for this project after Christmas. Otherwise, you could find inventory that could get lost in the shuffle.
Best of luck.
Edited by: Boardgames4UsUK on Oct 31, 2014 10:01 PM