Here is his reply to my request for more info:
The models are built to a basic standard for the price listed in the info attached. NSF also offer a full build, detail and fitting out service at extra cost.
The basic model has hatches, doors, conning tower detail, opening closing periscope hatches and movable periscopes.
The Alfa pictured is one of the more detail boats, the Los Angeles in the background is a standard boat.
I sell all over the world and have sold a few boats the USA, but my main market at the moment is Canada.
The cost of sending the model to the USA ranges from $114 up to $175 the service is fully insured, safe and fast.
I have not quoted the Oscar Class submarine as I am waiting on a price of shipping such a large and heavy model I think it could be costly, so at present the model is only being shipped to the UK.
I hope you find this helpful.
Please feel free to ask any further questions.