Oh, and BetMoose has this one, as well: https://www.betmoose.com/bet/greek-will-vote-no-in-referendum-1201

And we have Fairlay: https://www.fairlay.com/predict/registered/new/greece-referendum-will-result-in-a-yes-1/

And Predictious: https://www.predictious.com/politics/greek-bailout-referendum

I have to add, BetMoose, Fairlay and, Predictious are completely counterintuitive to me; the only intuitive site is, Directbet with a clear (although not favorable) odd offering.

Compare, UK mainstream fiat sites offered the YES at 4/9, the NO at 7/4.

Help in explaining betting odds, UK and US style: http://www.online-betting.me.uk/articles/understanding-betting-odds.html

You have still time 'til the evening to educate me about these sites and recommend me one with good odds, thanks!