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Comes in clear or blue liquid, the blue being cheaper, dirtier & not much weaker only by a few percent.
You'll find the both in any decent sized supermarket, the blue you'll find in almost all, I think 400ml odd size bottles. edit: I have in me head 470 or 480ml, I remember them being an off number, I bought that many over the years you'd think I'd know, but sure, they may have smaller sizes now too.
it used to be quite cheap but 4yrs ago when I was back in Crete I was suprized at how much the price had jumped up, but as it was a time I was trying out gas I didn't buy any & can't remember the price, sorry.
If anythings helpful there It'll be the top word, write it down & hand it over the counter & they will know straight away.