A navy uniform question

[Blitz]

Lately I've been thinking about US navy uniforms, mostly because of a good tv series (JAG). I collect german awards and nothing is going to change that, but that doesn't mean that I cant be curious..

What I'm interested in, is a complete navy admirals uniform (service dress blues) with coat, trousers and the hat. I've checked marlow white website, so I know what a brand new combination costs. I naturally cant order one directly from the maker because i'm not a US citizen.

So how much does a used modern set cost? And is it possible (legal) to acquire one?

Thank you for your time.