The first thing I look for with a potential new supplier, of any kind, is does it offer a physical address?
Three of the four you've listed do that.
In your case, the next action I'd advise is contacting each to see if international delivery is available. I saw that one company does offer international delivery, but demands payment for the goods
before telling you how much you'd be charged for delivery ...
Edit: This thread may also be of interest:
http://www.avforums.com/forums/av-ha...ps-europe.html 
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