Like you I'm a big fan of Guinness, but when in Town I stick to the Mythos.
No idea about the whatchamacallit or how much it is, but I would hazard a guess that it's not cheap!
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I think it's called a widget and it injects nitrogen into the beer, not that that helps you find any. How much would a can be in Seattle, Jeff? My guess is that it will be a similar price in a Plakias supermarket to a UK supermarket.
I have seen the draught version in some bars in Greece so if you don't find it in Plakias (as has been reported) then if you make a visit to Rethymnon or Hania I'm sure it will be there.
The Greek beers seem to go with the ambience of the Greek Islands, even though I don't drink lager in the UK, and I think you will find they are better than US beers such as Budweiser (US version not the Czech) or Miller Light. As you mention Seattle microbreweries it may be that you are into real ale- if so all I can say is "Good Man"; give the UK a try sometime.
Why not try the local drinks such as retsina, raki, ouzo, or the excellent local red wine. Go easy on the raki and ouzo as in my opinion they have a high potential for giving a hangover!!
Whatever you end up drinking my bet is that you will enjoy it in Plakias.
Mike